most common type of depression
Many people may think of depression as a symptom. However, depression is actually a type of illness. Similar to other illnesses, such as heart disease, depression can come in several forms (or types). The three most common depression types are:1  Major depression. 2  Bipolar disorder (also known as manic depression). 3  Dysthymia.owever, depression is actually a type of illness. Similar to other illnesses, such as heart disease, depression can come in several forms (or types). The three most common depression types are: 1  Major depression.