Mental health issues have increased substantially over the past three decades, though the size of the increase depends on which condition, age group, and time frame you look at. Globally, the age-standardized prevalence of mental disorders rose about 3.7% between 1990 and 2021. That may sound modest, but it masks much sharper spikes in specific populations. In the United States, depression prevalence jumped from 8.2% to 13.1% of people aged 12 and older in roughly a decade, and nearly one in four American adults now lives with a mental illness.
The Global Picture Since 1990
Across the world, mental disorders have grown steadily but not explosively when you adjust for population age. The age-standardized prevalence increased 3.7% from 1990 to 2021, with the burden of disability from these conditions rising 4.5% over the same period. That translates to an annualized increase of about 0.15% per year, a slow creep that adds up over decades and across billions of people.
These numbers account for population aging, which matters because older adults carry a high burden of mental illness. The raw number of people affected is far larger than the percentage suggests, simply because the global population has grown so much. More people are living with mental disorders than at any point in history, even if the per-capita rate has shifted only modestly.
Depression Has Surged in the U.S.
The sharpest increases show up in depression data from the United States. Between 2013–2014 and 2021–2023, depression prevalence among people aged 12 and older climbed from 8.2% to 13.1%, a roughly 60% relative increase in under a decade. The pattern held for both sexes, but the raw numbers were striking for each: depression in females rose from 10.9% to 16.0%, while in males it nearly doubled from 5.4% to 10.1%.
Adolescents are hit hardest. Among people aged 12 to 19, depression prevalence reached 19.2% in the most recent survey period, meaning nearly one in five teenagers met criteria for depression. That rate was higher than in any older age group, a reversal of historical patterns where depression tended to peak in middle age.
The COVID-19 Spike
The pandemic produced the single largest short-term jump in global mental health burden on record. In the first year of COVID-19, the worldwide prevalence of anxiety and depression increased by 25%, according to the World Health Organization. Lockdowns, isolation, fear of illness, grief, and economic disruption all contributed. Young people and women were disproportionately affected.
What made this spike different from a gradual trend was its speed. Decades of slow increase were dwarfed by a single year of acute stress. Some of that increase has receded as pandemic restrictions lifted, but mental health indicators in most countries have not returned to pre-2020 baselines.
Suicide Rates Tell a Parallel Story
Suicide rates in the United States rose 37% between 2000 and 2018, climbing from 10.4 to roughly 14.2 deaths per 100,000 people. A brief 5% dip occurred between 2018 and 2020, but rates returned to their peak by 2022.
The burden falls unevenly. Non-Hispanic American Indian and Alaska Native people had the highest suicide rate in 2023 at 23.8 per 100,000, followed by non-Hispanic White people at 17.6. Men die by suicide at nearly four times the rate of women (22.7 versus 5.9 per 100,000). Adults aged 85 and older had the highest rate of any age group, at 22.7 per 100,000, a fact that often surprises people who associate the crisis primarily with younger populations.
Social Media and Young People
One frequently cited driver of the youth mental health crisis is social media use. Children and adolescents who spend more than three hours a day on social media face double the risk of experiencing symptoms of depression and anxiety compared to those who spend less time. The U.S. Surgeon General flagged this as a serious enough concern to issue a public advisory on social media and youth mental health.
Three hours is not an extreme amount for many teenagers. Surveys consistently show that the average adolescent spends considerably more than that on social platforms daily, which means the elevated-risk group includes a large share of the teen population. The relationship between screen time and mental health is not as simple as “phones cause depression,” but the correlation is strong enough and consistent enough across studies that it has shifted public health recommendations.
How Much Is Better Detection?
A legitimate question behind the numbers is whether mental health problems have actually increased or whether people are simply more willing to seek help and receive diagnoses. The answer is likely both, but several data points suggest the increase is real and not just a measurement artifact.
Suicide is the hardest outcome to attribute to reporting changes. Dead is dead, and suicide rates rose 37% over two decades regardless of anyone’s willingness to discuss mental health. Similarly, emergency department visits for self-harm among young people have climbed in ways that can’t be explained by destigmatization alone. Antidepressant prescriptions in England more than doubled from 42 million in 2010 to 88 million in 2023, growing at about 5.4% per year. Some of that reflects broader prescribing practices, but the scale of the increase points to genuinely rising demand.
At the same time, reduced stigma has clearly expanded who gets counted. A teenager in 2024 is far more likely to tell a doctor about persistent sadness than a teenager in 2004. Screening tools are used more widely. Mental health language has entered everyday conversation. The most reasonable interpretation is that both forces are operating: real increases in distress, amplified by better detection.
Where Things Stand Now
As of 2022, an estimated 59.3 million American adults, 23.1% of the adult population, were living with a mental illness. That’s roughly one in four people. Among those, nearly half (48%) did not receive any treatment. About 137 million Americans, 40% of the population, live in areas designated as Mental Health Professional Shortage Areas, meaning there simply aren’t enough providers to meet demand.
The gap between need and access is one of the most important dimensions of the crisis. The number of people with diagnosable conditions has grown, but the treatment infrastructure has not kept pace. Burnout among workers reflects this broader strain: more than half of mid-level employees reported feeling burned out in 2024, with women and workers under 50 most affected.
The overall picture is one of steady, accelerating pressure. A slow global rise over three decades, a sharper climb in depression and anxiety over the past ten years, a dramatic pandemic spike, and a youth mental health crisis that shows no clear sign of reversing. The increases are real, they are large in certain populations, and the systems meant to address them remain stretched thin.