How common is major depressive disorder/clinical depression?

It’s very common worldwide.

According to the World Health Organization (WHO), depression affects about 280 million people globally, and MDD is the most prevalent form of depression.

  1. Global and U.S. prevalence
    • Globally

Around 3.8% of the population experiences depression, but rates vary across regions, cultures, and age groups.

    • United States
      • 4% of adults (about 21 million people) had at least one major depressive episode in the past year.
      • The rate was even higher among adolescents (12–17 years old), with 17% experiencing a major depressive episode.
  1. Gender differences
    • Women are about twice as likely as men to be diagnosed with MDD.

Biological, hormonal, and psychosocial factors likely play a role here.

  1. Lifetime risk

The lifetime prevalence of MDD is estimated to be around:

    • 10–20% for women.
    • 5–12% for men.

Underreporting and misdiagnosis
A doctor explaining the patient's results to the patient.

Depression often goes underdiagnosed in:

  • Older adults.
  • Men (who might express depression through irritability or substance use).
  • Cultures where mental health stigma is strong.

So, the real numbers might be even higher than reported.

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