"Responding to mental health needs is an obligation, not a choice."

Global Mental Health Crisis: Cases Nearly Double in 33 Years

A groundbreaking study published in The Lancet on October 11, 2024, reveals that the number of people living with mental health disorders globally has surged from approximately 599 million in 1990 to nearly 1.17 billion in 2023. This represents a staggering 95.5% increase in prevalence over the 33-year period.

Conducted by the Institute for Health Metrics and Evaluation (IHME) and the University of Queensland, the research is based on data from the 2023 Global Burden of Diseases, Injuries, and Risk Factors Study (GBD).

Key Findings: Prevalence and Types of Disorders

The study measured 12 distinct mental disorders. Anxiety disorders and major depressive disorder were the most common conditions reported in 2023.

• Anxiety disorders: Cases increased from 182 million in 1990 to 470 million in 2023. After accounting for population growth, this represents a 47% increase.
• Major depressive disorder: Cases rose from 102 million in 1990 to 236 million in 2023. After accounting for population growth, this represents a 24% increase.

Other disorders with lower prevalence in 2023 included anorexia (~4 million cases), bulimia (~14 million), and schizophrenia (~26 million).

Demographic Distribution: Who Is Most Affected?

The study reported notable differences in prevalence by age and sex.

Age

The burden of mental disorders peaked among individuals aged 15–19 years in 2023, with high rates persisting through ages 20–39. This marks a significant shift from previous GBD studies, where the peak burden was reported in middle-age.

Sex

In 2023, an estimated 620 million women and 552 million men had a mental disorder. While most disorders were reported more frequently in females, males showed higher rates of autism, conduct disorders, ADHD, personality disorders, and intellectual disability.

Impact on Global Health

Mental disorders now account for over 17% of all disability worldwide in 2023. Furthermore, they were the fifth leading cause of disability-adjusted life years (DALYs) globally, up from 12th place in 1990.

Potential Contributing Factors

Researchers and commentators have cited multiple factors that may be associated with the observed trends. Lead author Dr. Damian Santomauro (University of Queensland) stated that rising trends may reflect pandemic-related stress and long-term structural drivers such as poverty, insecurity, abuse, violence, and declining social connectedness.

The study's authors noted that the prevalence of depression increased during the COVID-19 pandemic and had not returned to pre-pandemic rates by 2023. Anxiety prevalence peaked during the pandemic and remained high through 2023.

Expert Commentary

Several experts provided observations on the findings, noting methodological considerations and potential influences on the data.

"While cases have increased, population growth plays a role." — Professor Philip Batterham (Australian National University), who cautioned that self-reported measures may lead to overestimates and highlighted cultural differences in the understanding of mental disorders.

"The estimates are 'the best we have' despite potential underreporting." — Dr. Paul Bolton (Johns Hopkins Bloomberg School of Public Health).

Dr. Robert Trestman (Virginia Tech Carilion School of Medicine) noted that reduced stigma may be contributing to increased reporting, while adverse living conditions may contribute to higher prevalence rates. Dr. Arthur Evans (American Psychological Association) stated that detection and diagnosis have improved over time.

Implications

The study's authors wrote that the increase in burden has not been matched by a proportional expansion of mental health services. They concluded that responding to mental health needs is "an obligation, not a choice."