While it’s not yet clear exactly what causes depression, researchers have made great progress in learning more about how to manage and treat this common mental health disorder. Here are some facts about depression, depression symptoms, and depression management that might surprise you.

What Is Depression?

Doctors diagnose MDD based on criteria in the American Psychiatric Association’s Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, or DSM-V. A depression diagnosis is made when at least five of the following symptoms occur nearly every day for at least two weeks:

Depressed moodLoss of pleasure in all or most activitiesSignificant weight change or change in appetiteChange in sleepChange in activityFatigue or loss of energyDiminished concentrationFeelings of guilt or worthlessnessThoughts of suicide

To diagnose major depression, either depressed mood or loss of pleasure in activities must be one of the symptoms.

Depression Resources

Many organizations also have online resources for people with depression, including:

NIMHNational Alliance on Mental IllnessAmerican Psychological AssociationDepression and Bipolar Support AllianceAnxiety and Depression Association of America

If you’re struggling with suicidal thoughts, go to your nearest emergency room or contact the Suicide and Crisis Lifeline by dialing the three-digit code 988. For help finding a therapist or another mental health professional, call the Substance Abuse and Mental Health Services Administration (SAMHSA)’s National Helpline at 1-800-662-HELP (4357) for a free, confidential referral for treatment. Additional reporting by Erica Patino and Christina Vogt.