Depression often begins in adulthood, but it can happen at any age, including childhood. Researchers believe that depression is likely caused by a combination of genetic, biological, environmental, and psychological factors.
Primack BA, Shensa A, Escobar-Viera C, et al. Use of multiple social media platforms and symptoms of depression and anxiety: A nationally-representative study among U.S. young adults. Comput Human Behav. 2017;69:1-9..
Qaseem A, Barry MJ, Kansagara D. Nonpharmacologic Versus Pharmacologic Treatment of Adult Patients With Major Depressive Disorder: A Clinical Practice Guideline From the American College of Physicians. Ann Intern Med. 2016;164(5):350-359..