Depression and bipolar disorders are similar mental conditions. For instance, if you have the latter disorder, you can also experience depression. However, there are important differences between clinical depression and bipolar disorder.

Onset

Depression can strike at any stage of life. Bipolar disorder typically manifests between the ages of 15 and 25.

Identification

Both depression and bipolar disorder affect your mood. However, those with bipolar disorder also experience periods of mania or extreme anxiety.

Depression Symptoms

Depression is more than feeling sad or down for a couple days. If those feelings persist for two weeks or more, then it's probably clinical depression. Symptoms include feelings of hopelessness, worthlessness and helplessness. You may have thoughts of suicide, guilt or self-hate, according to Medline Plus. Also, you may experience fatigue, irritability or changes in weight.

Bipolar Symptoms

Bipolar symptoms occur in periods. Manic symptoms are hyperactivity, reckless behavior such as binge drinking, and lack of concentration. You may also have feelings of grandeur or inflated ego, or your thoughts may constantly race. The symptoms of depressive episodes are similar to those of clinical depression.

Treatments

Treatment for bipolar disorder includes such medications as lithium or benzodiazepines, which are designed to stabilize your mood. Depression treatment includes talk therapy, tricyclic antidepressants and electroconvulsive therapy, which are intended to place the condition into remission.

Source:

Medline Plus: Major Depression

Medline Plus: Bipolar Disorder