The first step to getting appropriate treatment for depression is a physical examination by a physician. Certain medications as well as some medical conditions such as a viral infection, thyroid disorder, or low testosterone level can cause the same symptoms as depression, and the physician should rule out these possibilities through examination, interview, and lab tests. If no such cause of the depressive symptoms is found, the physician should do a psychological evaluation or refer the patient to a mental health professional.
A good diagnostic evaluation will include a complete history of symptoms: i.e., when they started, how long they have lasted, their severity, and whether the patient had them before and, if so, if the symptoms were treated and what treatment was given. The doctor should ask about alcohol and drug use, and if the patient has thoughts about death or suicide. Further, a history should include questions about whether other family members have had a depressive illness and, if treated, what treatments they may have received and if they were effective. Last, a diagnostic evaluation should include a mental status examination to determine if speech, thought patterns, or memory has been affected, as sometimes happens with depressive disorders.