It's normal to feel sad every once in a while. People who are depressed feel sad or irritable most of the time and struggle with other feelings of hopelessness and worthlessness.
Basics
Symptoms of depression include a depressed mood, weight gain or loss, issues sleeping, fatigue, loss of interest in pleasurable activities and thoughts of suicide.
Types
According to the National Institute of Mental Health, types of depression include major depression, dysthymic disorder, psychotic depression, postpartum depression and seasonal affective disorder.
Causes
Some contributing factors to depression include lack of social involvement and support, genetics, alcohol or drug abuse and environmental issues.
Treatment
Depression can be treated with individual therapy, group therapy, support groups, family therapy and medication.
Warning
Untreated depression can result in suicide. Signs of suicidal behavior include saying goodbye, references to death and suicide, recklessness and feelings of hopelessness.
