A serious medical condition in which a person feels very sad, hopeless, and unimportant and often is unable to live in a normal way.
A scientifically controlled study of the safety and effectiveness of a therapeutic agent (as a drug or vaccine) using consenting human subjects.
Depression is a common problem among older adults, but it is not a normal part of aging. It may be overlooked because for some older adults who have depression, sadness is not their main symptom. They may have other, less obvious symptoms of depression or they may not be willing to talk about their feelings.