Mental Health Statistics: Key Global and U.S. Data

Mental health statistics describe how common mental health conditions are, who is affected, who receives care and what the conditions cost individuals and societies. The headline figure from the World Health Organization is that about 970 million people, roughly 1 in 8 people worldwide, were living with a mental disorder in 2019, with anxiety and depression the most common.

This page brings together widely cited figures from the WHO, the U.S. National Institute of Mental Health (NIMH), the Centers for Disease Control and Prevention (CDC) and major research studies. Each figure is given with its source and year, because statistics change over time and depend heavily on how they were collected.

Understanding Mental Health Statistics

Before looking at numbers, it helps to know what kind of number you are reading. Most mental health statistics come from one of three sources: large population surveys using structured interviews or questionnaires, records of people diagnosed or treated in health services, and modeling studies such as the Global Burden of Disease project that combine many data sources.

Key terms include prevalence (how many people have a condition at a time or over a period), incidence (how many new cases arise), past-year versus lifetime prevalence, and disability-adjusted life years (a measure combining years lost to early death and years lived with disability). Our guide to epidemiology explains these measures in depth.

Global Mental Health Prevalence

The WHO's World Mental Health Report (2022), drawing on Global Burden of Disease estimates for 2019, provides the most widely used global figures:

Mental disorders are the leading cause of years lived with disability worldwide, accounting for about one in six such years, according to the WHO. People with severe mental health conditions die on average 10 to 20 years earlier than the general population, mostly from preventable physical diseases.

The COVID-19 pandemic added to this burden. A 2021 study in The Lancet estimated that, in 2020 alone, the pandemic was associated with about 53 million additional cases of major depressive disorder and 76 million additional cases of anxiety disorders worldwide, increases of roughly 28% and 26%, with women and younger people most affected.

Statistics by Mental Health Condition

Depression

The WHO estimates that about 3.8% of the world's population, including about 5% of adults, experience depression, and that it is about 50% more common among women than men. More than 10% of pregnant women and women who have recently given birth experience depression, according to WHO estimates. See our full guide to depression.

Anxiety disorders

Anxiety disorders are the most common group of mental disorders worldwide. In the U.S. National Comorbidity Survey Replication (2001–2003), anxiety disorders were the most common class, with a lifetime prevalence of about 29% and past-year prevalence of about 18%. Specific phobias and social anxiety disorder were among the most common individual diagnoses. Learn more in our overview of anxiety disorders.

Bipolar disorder and schizophrenia

Bipolar disorder affected about 40 million people worldwide in 2019, and schizophrenia about 24 million (WHO). Schizophrenia most often begins in late adolescence or early adulthood. Although less common than anxiety or depression, these conditions are associated with substantial disability, and access to specialist care is very limited in many countries: the WHO reports that most people with psychosis worldwide do not receive mental health services.

ADHD and autism

A widely cited 2007 meta-analysis by Guilherme Polanczyk and colleagues estimated the worldwide prevalence of ADHD in children and adolescents at about 5%, with studies of adults suggesting around 2–3%. For autism, the WHO estimates that about 1 in 100 children worldwide is autistic, while U.S. surveillance by the CDC, which actively reviews health and education records, has reported higher figures that have risen over time, largely reflecting broader definitions and better identification.

Substance use disorders

Substance use disorders frequently occur alongside other mental health conditions. The WHO estimates that alcohol use causes about 2.6 million deaths a year globally (2019 data). Because definitions and data sources vary widely between substances and countries, it is best to consult the WHO and the United Nations Office on Drugs and Crime World Drug Report for current figures.

When Mental Disorders Begin

One of the most important findings in psychiatric epidemiology concerns timing. In the National Comorbidity Survey Replication, Ronald Kessler and colleagues (2005) found that about half of all lifetime cases had begun by age 14 and three-quarters by age 24. A 2022 global meta-analysis by Marco Solmi and colleagues reached a similar conclusion: the peak age of onset for mental disorders is around 14.5 years, and about a third begin before age 14.

Delays in getting help are often long. A 2005 analysis by Philip Wang and colleagues found median delays between first onset and first treatment ranging from about 6–8 years for mood disorders to 9–23 years for anxiety disorders in the United States. These findings are a key reason for the emphasis on early intervention and school-based mental health support.

U.S. Mental Health Statistics

In the United States, the main source of national figures is the annual National Survey on Drug Use and Health (NSDUH), summarized by NIMH and SAMHSA. According to NIMH's summary of the 2022 survey:

• About 23% of U.S. adults (around 59 million people) experienced any mental illness in the past year.
• About 6% of adults (around 15 million) experienced a serious mental illness that substantially interfered with major life activities.
• Young adults aged 18–25 had the highest rates of any adult age group.
• Only about half of adults with any mental illness received mental health treatment in the past year.

The NSDUH figures are based on household surveys and statistical models rather than clinical diagnosis, so they are estimates. They also exclude some groups, such as people who are homeless and not in shelters or who live in institutions.

Demographic Differences

Rates differ across groups, though patterns vary by condition:

• Gender: Women have higher rates of depression and anxiety disorders, while men have higher rates of substance use disorders and die by suicide more often.
• Age: Most conditions start in adolescence and early adulthood; in many recent surveys, young adults report the highest levels of distress.
• Sexual and gender minority groups: LGBTQ+ people report higher rates of depression, anxiety and suicidal thoughts in many studies, which researchers link largely to stigma and discrimination (the "minority stress" model). See LGBTQ mental health.
• Income and social conditions: Poverty, unemployment, housing insecurity and exposure to violence are associated with higher rates of many conditions, and the relationship runs in both directions.
• Race and ethnicity: In the U.S., prevalence estimates vary between groups, and differences in access to care are often larger than differences in prevalence. Racial and ethnic minority groups are less likely to receive treatment. See racial trauma.

Treatment Gaps

Large gaps exist between need and care. Key findings include:

• A study of WHO World Mental Health Surveys led by Graham Thornicroft (2017) found that only about 23% of people with major depressive disorder in high-income countries received minimally adequate treatment, compared with about 3% in low- and lower-middle-income countries.
• The WHO's 2022 report states that 71% of people with psychosis worldwide do not receive mental health services.
• Whitney and Peterson's 2019 analysis found that about half of U.S. children aged 6–17 with a treatable mental health disorder did not receive care from a mental health professional.

Common barriers include cost, shortage of trained professionals, long waiting times, stigma, lack of knowledge about where to get help and, in many countries, very low spending on mental health. The WHO reports that governments spend on average just over 2% of their health budgets on mental health. For practical information on access, see how to find a therapist and free mental health resources.

Suicide Statistics

This section gives brief population figures. If you or someone you know is struggling, please see our crisis resources page for helplines.

• The WHO estimated that about 703,000 people died by suicide worldwide in 2019, more than 1 in every 100 deaths.
• Suicide was the fourth leading cause of death among 15–29-year-olds globally in 2019.
• About 77% of global suicides occurred in low- and middle-income countries.
• In the United States, the CDC recorded about 49,000 suicide deaths in 2022, with men accounting for nearly 80%.

Suicide is preventable. Evidence-based prevention includes restricting access to lethal means, responsible media reporting, training people to recognize and respond to distress, and follow-up care after a crisis.

Economic Impact

Mental health conditions carry large economic costs, mostly through lost productivity rather than health care spending. The WHO estimates that depression and anxiety alone cost the global economy about US$1 trillion each year in lost productivity, equivalent to about 12 billion lost working days. A 2011 report by David Bloom and colleagues for the World Economic Forum estimated the total global cost of mental disorders at about US$2.5 trillion in 2010, projected to rise to about US$6 trillion by 2030.

Investment in care can pay back. Chisholm and colleagues (2016) estimated that every US$1 invested in scaling up treatment for depression and anxiety would return about US$4 in improved health and productivity. See our guide to workplace mental health.

Youth Mental Health

Whitney and Peterson's 2019 analysis of the U.S. National Survey of Children's Health estimated that about 1 in 6 U.S. children aged 6–17 (16.5%) had at least one mental health disorder in 2016. The WHO estimates that about 1 in 7 adolescents aged 10–19 worldwide experiences a mental disorder.

The CDC's Youth Risk Behavior Survey has tracked worrying trends among U.S. high school students. In 2021, 42% reported persistent feelings of sadness or hopelessness, up from 28% in 2011, with higher levels among girls and LGBTQ+ students. The 2023 survey showed small improvements on some measures, but levels remained high. Researchers continue to debate the causes, with candidate factors including academic pressure, social media, reduced sleep and in-person socializing, and economic and social stress. See our pages on teen mental health and social media and mental health.

Data Quality and Limitations

Mental health statistics are valuable but imperfect. When you read a figure, it is worth asking:

• Who was counted? Surveys of households miss some groups; clinic data only include people who sought care.
• How was a "case" defined? A brief screening questionnaire usually produces higher rates than a full diagnostic interview.
• What time frame? Lifetime prevalence is always higher than past-year or current prevalence.
• Which year and country? Figures change, and countries collect data differently; many low-income regions have little data at all.
• Does stigma affect reporting? People may underreport symptoms, especially where mental illness is highly stigmatized.
• Has the diagnostic system changed? Revisions to the DSM and ICD can shift rates without any real change in how many people are struggling.

Viral statistics shared online often lack a source, mix up lifetime and past-year figures, or come from small opt-in polls. Checking the original organization's report, as listed in the sources for this page, is the best safeguard. For common misconceptions, see mental health myths.