Mental Health: The Complete Guide

Key numbers at a glance

What mental health is

Mental health covers how you think, feel and act, how you handle stress, how you relate to other people and how you make choices. Like physical health, it is something everyone has, and it moves along a range rather than switching between well and ill. Most people have stretches of low mood, worry or exhaustion in response to hard events. A mental health condition is diagnosed when symptoms are persistent, distressing and get in the way of daily life, work or relationships.

Mental health conditions are among the most common health conditions in the US, affecting people of every age, background and income, and many more people have symptoms that never reach a diagnosis. They are not a sign of weakness or a failure of character. They arise from a mix of factors, including genetics, brain chemistry, physical health, life experiences such as trauma or loss, and current circumstances such as money worries, isolation or an unhealthy workplace.

The single most important message about mental health is that most conditions respond to treatment, and that people generally do better the earlier they get help. Many people wait years before talking to anyone, often because they are not sure their problems are serious enough. You do not need to be in crisis to ask for help, and you do not need to know what is wrong before you see your doctor.

Stress and how your body responds

Stress is the physical and psychological response to demands that feel beyond your resources. When you perceive a threat, your body releases stress hormones including epinephrine and cortisol. Your heart beats faster, your breathing quickens, your muscles tense and your attention narrows. This response evolved to help you deal with immediate danger, and in short bursts it is normal and even useful: it can sharpen focus before an exam or give you energy to meet a deadline.

Problems arise when stress is sustained without recovery. Long-term stress can affect sleep, mood, concentration, appetite, blood pressure and immune function. People under chronic stress often notice headaches, stomach upset, muscle tension, irritability and a sense of being constantly on edge. They also tend to fall back on habits that make things worse, such as drinking more, sleeping less and dropping exercise and social contact.

Managing stress has two parts. The first is dealing with the source where you can: renegotiating a workload, asking for help with caregiving, tackling a financial problem with professional advice. The second is managing the body's response, so that you are not running on alarm all day. Techniques manage symptoms; they do not replace changing what you can change. Both parts matter, and it helps to write down which stresses are in your control and which are not.

Slow breathing

Slow breathing is one of the quickest ways to calm the stress response, because breathing is the one part of it you can control directly. Aim for about 6 breaths a minute; a simple pattern is 4 seconds in and 6 seconds out. What matters most is that the out-breath is longer than the in-breath. Breathe comfortably rather than forcing large volumes of air, which can make you lightheaded. Most people notice an effect within a few minutes. Practice for 5 minutes at a fixed time each day, when you are calm, so the technique is familiar when you need it.

Anxiety

Anxiety is a normal response to uncertainty or danger. An anxiety disorder is persistent worry or fear that is out of proportion to the situation, hard to control and present most days, with physical symptoms alongside. Common physical symptoms include a pounding heart, shortness of breath, trembling, sweating, nausea, muscle tension and trouble sleeping. Anxiety disorders include generalized anxiety disorder, panic disorder, social anxiety disorder and specific phobias.

Panic attacks are sudden surges of intense fear with strong physical symptoms, such as chest tightness, a racing heart and a feeling of choking or of losing control. They usually peak within minutes. They are frightening but not dangerous in themselves. Because their symptoms overlap with heart and lung problems, chest pain, severe shortness of breath or fainting should be treated as a medical emergency until a doctor has ruled out a physical cause, rather than assumed to be panic.

Avoidance is the engine that keeps anxiety going. Avoiding a feared situation brings relief in the short term, which teaches your brain that the situation was dangerous and that avoiding it was what kept you safe. Over time, the list of avoided situations tends to grow. This is why effective treatment works by approaching rather than avoiding: gradually facing feared situations in manageable steps lets the brain learn that they can be tolerated.

• Lengthen your out-breath when symptoms rise
• Approach avoided situations gradually, starting with the easiest
• Cut back on caffeine, which can worsen symptoms; 400 mg a day is the general adult limit
• Reduce alcohol, which eases anxiety briefly and worsens it afterward
• Ask your doctor to check for physical causes, such as thyroid problems

Depression and low mood

Everyone feels low at times. Depression is different in its persistence and its reach. Its core symptoms are low mood and a loss of interest or pleasure in things you normally enjoy, lasting most of the day, nearly every day, for at least two weeks. Other symptoms can include changes in sleep and appetite, tiredness and low energy, difficulty concentrating, feelings of worthlessness or guilt, slowed movement or restlessness, and thoughts of death or suicide. How long symptoms have lasted is what most clearly separates depression from ordinary unhappiness.

Depression is common and treatable. The main treatments are psychotherapy, medication, or both together, and most people improve with treatment. Depression can also make you feel that nothing will help and that you do not deserve help, which is one reason people delay. That feeling is a symptom of the condition, not an accurate assessment of your situation. Recovery is often gradual, with good and bad days.

Some daily steps support recovery alongside treatment. Keep a routine, particularly a fixed wake time, even when sleep has been poor. Get outside within a couple of hours of waking. Keep some physical activity going, even a short walk. Tell one person how you are feeling; this is consistently the hardest step and one of the most useful. Avoid alcohol, which worsens mood and sleep. If you have been prescribed medication, do not stop it suddenly without talking to your doctor.

Burnout, loneliness and the pressures of daily life

Not every mental health problem fits a diagnostic category. Two experiences that affect very large numbers of people are burnout and loneliness, and both can lead to or overlap with depression and anxiety. Neither is a personal failing. Both are worth taking seriously early, because they are easier to address before they become entrenched and before they start to affect sleep, health and relationships.

Burnout

The World Health Organization classifies burnout in ICD-11 as an occupational phenomenon rather than a medical condition. It has three components: energy depletion or exhaustion, increased mental distance or cynicism about your job, and reduced professional efficacy. It is defined by its relationship to work, and its distinguishing feature is that genuine rest does not restore you. Ask yourself whether a real break, such as a vacation, leaves you feeling recovered, and take the answer seriously. Ask someone close to you whether they have noticed you becoming cynical.

The levers are usually workload, control over how you work, and acknowledgment of what you do, so raise it early with a manager, human resources or an employee assistance program. Do not self-diagnose burnout when the picture might be depression, thyroid disease, anemia or sleep apnea. If exhaustion or low mood is present regardless of work, or comes with weight change, palpitations or persistent fatigue, see your doctor.

Loneliness

Loneliness is the gap between the social connection you have and the connection you want. It is not the same as being alone: you can feel lonely in a crowd, and many people who live alone do not feel lonely. The US Surgeon General's advisory on loneliness and isolation describes it as linked to higher risk of heart disease, stroke, depression and dementia. Young adults and older adults living alone report particularly high rates.

Regular, structured contact tends to help more than occasional large events: a weekly class, a volunteering role, a faith community or a standing call with a friend. Volunteering creates contact with a purpose attached, which many people find easier. Passive scrolling through social media rarely substitutes for real contact. Older adults can find local programs through the Eldercare Locator at 1-800-677-1116, and a senior center or your doctor can point you to community groups. Do not wait to feel like socializing before arranging something; the feeling tends to follow the contact.

Daily foundations: sleep, activity, alcohol and screens

Some everyday habits have a strong two-way relationship with mental health. They are not a replacement for treatment, but they make treatment work better and make relapse less likely. Poor sleep, inactivity and drinking tend to worsen mood, and low mood in turn makes each of them more likely, so small improvements in one area often make the others easier. Pick the area that feels most manageable and start there.

Sleep

Poor sleep worsens mood, anxiety and the ability to cope with stress, and almost every mental health condition disrupts sleep. Adults need 7 or more hours a night. A fixed wake time, daylight in the morning, a cool, dark bedroom and a wind-down period before bed all help. If insomnia has lasted three months or more, see your doctor; cognitive behavioral therapy for insomnia is a well-studied treatment.

Physical activity

Regular physical activity lowers the risk of depression and anxiety and improves sleep, and a single session can ease anxiety for a time afterward. The adult target is 150 minutes of moderate activity a week plus strength work on 2 days, but any increase from very little helps. When mood is low, a short walk outdoors is a realistic place to start.

Alcohol

Alcohol relieves anxiety briefly and worsens it afterward, which makes it an unusually effective way to entrench the problem it appears to solve. It also fragments the second half of the night's sleep. If you drink, the Dietary Guidelines advise up to 2 drinks a day for men and 1 for women, on days alcohol is consumed. A US standard drink contains 14 g of alcohol: 12 fl oz of beer, 5 fl oz of wine or 1.5 fl oz of distilled spirits. Binge drinking means 4 or more drinks for women or 5 or more for men in about 2 hours. If you drink heavily every day, do not stop suddenly without medical advice, as alcohol withdrawal can cause seizures.

Screens

The main way evening device use affects sleep and mood is through mental arousal from content designed to keep you engaged, more than through blue light; night-mode filters have shown limited effects on sleep in trials. Repeated brief checks disrupt more than one longer session. The most effective single change is to charge your cell phone in another room and use a regular alarm clock. A device-free buffer of 30 to 60 minutes before bed helps, and turning off notifications overnight works better than relying on willpower.

Mindfulness and self-help

Mindfulness means deliberately attending to present experience without trying to change or judge it. Structured programs, typically 8 weeks long, have a reasonable evidence base for reducing stress. The best-studied program for depression is mindfulness-based cognitive therapy, which helps prevent depression from returning in people who have had it before. Effects are modest, and larger for structured courses than for apps, which are far less well studied. A useful daily practice is 10 to 20 minutes. Your attention will wander; noticing that and returning is the practice, not a failure of it.

Mindfulness is not a replacement for treatment of severe depression, and it does not suit everyone. Some people, particularly those with a history of psychosis, severe depression or trauma, find intensive meditation distressing. Talk to your doctor or therapist before starting intensive practice in those situations, and stop if it increases distress. Use it alongside any treatment you have been prescribed.

Other forms of self-help also have evidence behind them. Guided self-help based on cognitive behavioral therapy, using a structured book or online program, can help with mild to moderate anxiety and depression, especially with some support from a professional. Keeping a simple mood and activity diary can reveal patterns you might otherwise miss, such as which activities lift your mood and which drain it. Scheduling small, achievable activities that bring pleasure or a sense of accomplishment, an approach called behavioral activation, is one of the core techniques used for depression.

Treatment: talk therapy and medication

The two main forms of treatment for common mental health conditions are psychotherapy, often called talk therapy, and medication. They are not mutually exclusive, and for moderate to severe depression the combination often works better than either alone. Your doctor can help you decide what to try first, based on how severe your symptoms are, what you have tried before and what you prefer.

Talk therapy

Psychotherapy covers structured psychological treatments delivered by a trained professional, such as a psychologist, licensed clinical social worker, licensed professional counselor or psychiatrist. Cognitive behavioral therapy (CBT) is the most widely studied for anxiety and depression. It works on the links between thoughts, feelings and behavior, and uses practical exercises between sessions. Other approaches include interpersonal therapy, problem-solving therapy and, for some conditions, exposure-based therapy. A typical course is a limited number of sessions, often weekly, delivered in person, by phone, by video or digitally.

Most of the change in therapy happens between sessions, in the exercises and practice you do in daily life. It is normal for early sessions to feel awkward. If an approach is not fitting after a few sessions, say so; a good therapist will adjust or help you find someone better suited. Do not judge therapy on one difficult session.

Medication

Antidepressants are commonly prescribed for depression and several anxiety disorders. They usually take several weeks to reach their full effect, and side effects are often most noticeable in the first weeks. Antidepressants carry an FDA boxed warning about a possible increase in suicidal thoughts and behaviors in children, teens and young adults under 25, especially when first starting or changing dose, so anyone in that age group should be monitored closely. Do not stop an antidepressant suddenly without talking to your doctor, as stopping abruptly can cause withdrawal-like symptoms and raise the risk of relapse. Tell your doctor and pharmacist about all other medicines and supplements you take, as some, such as St. John's wort, interact with antidepressants.

Mental health across life and in specific groups

Mental health needs and risks vary with age and circumstances, and some groups benefit from specific attention. The signs of a problem can look different in a teenager, a new parent or an older adult, which is one reason they are often missed. Knowing what to look for in each group makes it easier to act early, whether for yourself or for someone you care about.

Children and teens

Many lifelong mental health conditions begin in childhood or adolescence. The US Preventive Services Task Force recommends screening for depression in adolescents aged 12 to 18 and for anxiety in children and adolescents aged 8 to 18, usually at checkups. Signs worth discussing with your child's pediatrician include lasting changes in mood, sleep, eating or school performance, withdrawal from friends and activities, frequent physical complaints without a clear cause, and self-harm. Talk openly with your child, take what they say seriously, and keep the conversation going rather than relying on one big talk.

Pregnancy and after birth

Depression and anxiety can develop during pregnancy or in the year after birth. Many new parents experience the baby blues, with tearfulness and mood swings in the first days after delivery, which usually pass within about two weeks. Symptoms that are more severe, last longer or interfere with caring for yourself or your baby may be perinatal depression, which is common and treatable. Tell your obstetric provider, your baby's pediatrician or your own doctor. Thoughts of harming yourself or your baby, confusion, or seeing or hearing things that are not there need urgent help: call 911 or 988.

Older adults

Depression is not a normal part of getting older, though it is often missed because it can show up as tiredness, poor sleep, aches or memory complaints rather than sadness. Loss, isolation, chronic illness and medication side effects all raise risk. New confusion in an older adult often signals infection, dehydration or a medication effect and should be checked promptly. Medicare covers a yearly depression screening in primary care.

People with long-term physical conditions

Living with a long-term condition such as diabetes, heart disease, chronic pain or cancer raises the risk of depression and anxiety, and those in turn can make it harder to manage the physical condition. Tell your care team about your mood as well as your physical symptoms; treating both tends to improve both. Ask whether your clinic offers integrated behavioral health care.

Getting help in the US: screening, finding care and cost

Your primary care doctor is often the best first stop. The USPSTF recommends that all adults be screened for depression, and that adults under 65, including pregnant and postpartum people, be screened for anxiety, usually with a short questionnaire at a checkup. Your doctor can rule out physical causes, start treatment, prescribe medication if appropriate and refer you to therapy or to a psychiatrist. You do not need a referral to contact many therapists directly, though some insurance plans require one.

There are several routes to finding a therapist. Your insurance plan's directory lists in-network providers. Many employers offer an employee assistance program with a few free, confidential sessions. FindTreatment.gov, run by SAMHSA, lists treatment facilities for mental health and substance use. The SAMHSA National Helpline at 1-800-662-4357 is free, confidential and available 24/7 for treatment referrals and information. Community mental health centers and university training clinics often offer care on a sliding fee scale.

Cost is a real barrier for many people, so check coverage before you start. Marketplace plans bought through HealthCare.gov must cover mental health and substance use services, and federal parity rules generally require many plans to cover them on terms no more restrictive than physical health care. Medicare and Medicaid also cover mental health services. Ask your insurer about copays, deductibles and any limits on sessions, and ask the therapist whether they are in network.

Preparing for the appointment

Write down your main symptoms, when they started, how often they happen and how they affect work, sleep and relationships. Note any recent stresses or changes, your alcohol and drug use, and all medicines and supplements you take. It can help to bring someone you trust. Be honest about thoughts of self-harm; your doctor asks because it changes what help is needed, and saying it out loud is often a relief. Useful questions include what might be causing your symptoms, what treatment options there are, how long they take to work, and what to do if things get worse.

Supporting someone else, and what to do in a crisis

When someone close to you is struggling, the most common response is to say nothing for fear of saying the wrong thing. Saying something imperfect is reliably better than silence. Ask directly, in plain words, how they are doing, and then listen longer than feels comfortable before offering anything. Resist opening with advice or with what worked for you. Make specific, small offers of help, such as driving them to an appointment, and follow through. Help them connect to professional support rather than trying to become it yourself.

If you are worried someone may be thinking about suicide, ask them directly. Evidence shows that asking about suicide does not put the idea in someone's head or increase risk, and it often brings relief. The National Institute of Mental Health describes five action steps: ask, help keep them safe, be there, help them connect, and stay connected. Never promise to keep a disclosure of immediate danger secret.

The 988 Suicide & Crisis Lifeline is free and available 24/7 by call or text to 988. You can contact it if you are in crisis yourself, or to get advice on helping someone else, and you can call it together with the person you are worried about. If someone is in immediate danger or has seriously harmed themselves, call 911 or go to the nearest emergency room. If someone may have taken an overdose of medicine, call 911, and for advice on a poisoning that is not an emergency, call Poison Control at 1-800-222-1222.

• Ask directly and listen without rushing to solutions
• Remove or secure means of harm, such as medicines and firearms, if someone is at risk
• Call or text 988 together if they are in crisis
• Call 911 if they are in immediate danger
• Look after your own support too; caring for someone is demanding

Myths, and a four-week plan for your mental health

Misunderstandings about mental health keep people from seeking help. Some of the most common are that depression is a choice or a weakness, that therapy is only for people in crisis, that talking about suicide makes it more likely, that antidepressants change your personality, and that children are too young to have mental health problems. None of these is supported by the evidence. Mental health conditions are health conditions; asking about suicide does not increase risk; therapy helps with a wide range of everyday problems; and treatment, when it fits, generally helps people feel more like themselves, not less.

The plan below is for building a foundation that supports mental health. It is not a substitute for treatment. If your symptoms are severe, have lasted most days for two weeks or more, or include thoughts of self-harm, start by talking to your doctor or calling or texting 988, and use this plan alongside the care you receive. Repeat any week as needed.

Week 1: anchor your day

Set a fixed wake time and keep it every day, including weekends. Get outside for at least 10 minutes within a couple of hours of waking. Charge your phone outside the bedroom. Each evening, note your mood on a simple scale and one thing you did that day. A regular wake time steadies your body clock. Notice patterns as they emerge.

Week 2: move and breathe

Add a short walk on most days, building toward 20 to 30 minutes. Practice slow breathing, 4 seconds in and 6 seconds out, for 5 minutes at the same time each day. Notice how much caffeine and alcohol you have, and cut back on whichever is higher than you would like. Small, regular doses work better than occasional long sessions. Write down how you feel before and after.

Week 3: connect

Arrange two regular points of contact, such as a weekly call with a friend and a class or volunteer shift. Tell one person how you have really been feeling. Schedule one activity each day that gives you either pleasure or a sense of accomplishment, however small. Put these in your calendar. Choose contact that feels manageable rather than ideal, and keep it going even on weeks when you would rather cancel.

Week 4: review and reach out

Look back over your mood notes and see which activities helped. Keep those, and drop what did not. If your mood, anxiety or sleep has not improved, or has worsened, book an appointment with your doctor and bring your notes. Save 988 in your phone, and share it with someone you care about. Then plan the next month. Keep the habits that helped most.

Every guide in this topic

• The Evidence on Stress, Without the Hype
• The Evidence on Low Mood and Depression, Without the Hype
• The Evidence on Anxiety, Without the Hype
• Burnout: Sorting the Evidence From the Noise
• The Evidence on Mindfulness, Without the Hype
• The Evidence on Loneliness, Without the Hype
• The Evidence on Talk Therapy, Without the Hype
• The Evidence on Screen Time and Mood, Without the Hype
• Supporting Someone Else: What the Evidence Actually Says
• What the Guidance Really Says About Alcohol and Mental Health

Frequently asked questions

How do I know if I need professional help?

See your doctor if low mood, worry or loss of interest has lasted most days for two weeks or more, if symptoms are interfering with work, sleep or relationships, if you are using alcohol or drugs to cope, or if you have panic attacks. You do not need to wait until things are severe. If you have thoughts of harming yourself, call or text 988 now.

What is the difference between sadness and depression?

Sadness is a normal response to loss or disappointment and usually eases with time and support, often with lighter moments mixed in. Depression is persistent low mood or loss of interest, lasting most of the day, nearly every day, for at least two weeks, often with changes in sleep, appetite, energy and concentration. Duration and impact on daily life are the main differences.

What happens when I call or text 988?

You are connected to a trained crisis counselor who will listen, help you work through what is happening and talk about ways to stay safe. The service is free, confidential and available 24/7 in English and Spanish, with interpretation for other languages. You can also contact 988 for advice about someone else. In immediate danger, call 911.

Does therapy actually work?

Yes, for many people. Psychotherapies such as cognitive behavioral therapy are well studied for anxiety and depression, and many people improve within a limited number of sessions. Results depend on the fit between you, the approach and the therapist, and on practicing skills between sessions. If one therapist or approach does not work, another may.

Are antidepressants addictive?

Antidepressants are not considered addictive in the way alcohol or opioids are, and people do not crave them. However, stopping some antidepressants suddenly can cause unpleasant discontinuation symptoms such as dizziness, irritability and flu-like feelings. Your doctor can help you reduce the dose gradually when the time comes, so never stop on your own.

How can I find a therapist I can afford?

Start with your insurance plan's directory of in-network providers, and check copays and session limits. Ask your employer about an employee assistance program. Community mental health centers and university training clinics often charge on a sliding scale. FindTreatment.gov and the SAMHSA National Helpline at 1-800-662-4357 can point you to local options, including low-cost care.

Can exercise and diet treat depression?

Regular physical activity is linked to a lower risk of depression and can help improve mood, and a balanced diet supports overall health. They are valuable parts of looking after your mental health, but they are not a replacement for treatment when depression is moderate or severe. Use them alongside therapy or medication your doctor recommends.

Is it safe to ask someone if they are thinking about suicide?

Yes. Asking directly and calmly does not plant the idea or increase risk; it often brings relief and opens the door to help. If the answer is yes, stay with them, help remove access to means of harm, and call or text 988 together. If they are in immediate danger, call 911 or go to the nearest emergency room.

Do mental health apps help?

Some apps based on cognitive behavioral therapy or mindfulness can help with mild stress, anxiety or low mood, but most have far less evidence than structured programs or therapy, and quality varies widely. Use them as a supplement rather than a substitute for care, and check how an app handles your personal data before sharing sensitive information.

Will my employer find out if I get mental health treatment?

Your health information is generally protected by federal privacy law, and your doctor or therapist cannot share it with your employer without your permission, except in limited circumstances such as a risk of serious harm. Employee assistance programs are typically confidential too. If you need workplace adjustments, you can choose what to share.

When to speak to a doctor

See your doctor if low mood, anxiety or loss of interest has lasted most days for two weeks or more, if symptoms interfere with work, sleep or relationships, if you have panic attacks, if insomnia has lasted three months or more, or if you are drinking to cope or feel shaky or anxious without alcohol. Get urgent help for hearing voices, severe confusion, or postpartum thoughts of harming yourself or your baby. If you have thoughts of harming yourself or ending your life, call or text the 988 Suicide & Crisis Lifeline at 988, any hour. Call 911 or go to the nearest emergency room if someone is in immediate danger, has seriously harmed themselves or may have taken an overdose, and call 911 for chest pain, severe shortness of breath or fainting rather than assuming it is a panic attack. For poisoning advice, call Poison Control at 1-800-222-1222.

Where this comes from

• National Institute of Mental Health — Depression
• National Institute of Mental Health — Anxiety Disorders
• National Institute of Mental Health — 5 Action Steps for Helping Someone in Emotional Pain
• US Preventive Services Task Force — Depression and Suicide Risk in Adults: Screening
• US Preventive Services Task Force — Anxiety Disorders in Adults: Screening
• US Preventive Services Task Force — Depression and Suicide Risk in Children and Adolescents: Screening
• US Preventive Services Task Force — Anxiety in Children and Adolescents: Screening
• 988 Suicide & Crisis Lifeline — Help Someone Else
• SAMHSA — National Helpline
• HHS — Our Epidemic of Loneliness and Isolation: The U.S. Surgeon General's Advisory

How this page was put together

Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarized or generalized beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.

Medical disclaimer

This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to your doctor, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 911.