Others have ongoing, chronic symptoms. Depression Can Involve Mood Cycles. Causes of Depression Causes Are Not Always Known. In some cases, symptoms appear suddenly for no apparent reason. In others, the symptoms seem to be associated with a life crisis, stress, or other illness.
Research shows that depressive illnesses run in families.
An Accurate Diagnosis is Needed Diagnosis Involves a Good Checkup. Know the Symptoms of Depression Depression Hurts. Know the Symptoms of Mania Mania Can Cause Chaos. Get Help Treatment Is Needed. When four or more of these symptoms last longer than 2 weeks or interfere with ordinary functioning, professional treatment is needed.