Read about the symptoms of depression, which can be mild, moderate or severe. Symptoms can also be classed as psychological, physical and social.
Depression often varies according to age and gender, with symptoms differing between men and women, or young people and older adults.
Common signs and symptoms of depression in children and teenagers are similar to those of adults, but there can be some differences.
WebMD explains the different signs and symptoms of depression in adults, teens, and children.