Depression

Continuous low mood or sadness, Feelings of hopelessness and despair, Low self-esteem, Crying and tearfulness, Feelings of guilt, Feeling irritable and intolerant of others, Loss of motivation and little interest in activities that were once enjoyable, Difficulty making decisions, Suicidal thoughts or thoughts of harming yourself, Feeling anxious or worried are all symptoms of depression.

Depression - National Institute of Mental Health (NIMH)

New findings could improve diagnosis, treatment of depression

Depression Behavioral Health

Recognizing the Lesser-Known Symptoms of Depression

Depression: Genetics and More - 23andMe

11 causes of depression - Flow Neuroscience

The effects of depression on the body and physical health

Depression: Physical symptoms, causes, and how to cope

Depression Statistics Everyone Should Know

Can Depression Kill You? Health Effects of Untreated Depression