Depression: Depression is a common mental health disorder characterized by persistent low mood, loss of interest in activities, changes in appetite or sleep patterns, fatigue, and feelings of hopelessness.
Dysthymia: Dysthymia is a milder form of depression where individuals experience chronic low mood for at least two years but may still be able to function reasonably well.
Major Depressive Disorder (MDD): MDD is a severe form of depression characterized by intense low mood that interferes with daily functioning and lasts for at least two weeks.