Since many medical illnesses can cause the same symptoms, a thorough medical exam is often needed, especially if the first depression occurs after the age of 40. The first step is to seek treatment from a qualified professional whom you trust. You may choose to consult:

 
• Your family physician or internist  
• A psychiatrist, a medical doctor who specializes in diagnosing and treating mental illness; psychiatrists are able to prescribe prescription medications and to diagnose general medical conditions  
• A psychologist, who is a therapist with a PhD in psychology and/or a related discipline, or a therapist with a master’s degree who is working toward a PhD  
• A licensed clinical social worker (LCSW), who is a counselor with a master’s degree in psychology and counseling  
• A marital, family, and child counselor (MFCC)  
• A psychiatric social worker or psychiatric nurse  
• A certified alcohol- and substance-abuse counselor, when depression is linked to alcoholism or drug addiction

Psychologists, counselors and social workers cannot write prescriptions, but they often work in association with a psychiatrist when medications are recommended.

It is important to seek treatment from a professional whom you trust. If the professional has a manner that seems indifferent, or intimidating to you in any way, seek a different professional.

The clinician will take a careful history, asking about:

 
• How the symptoms developed, how long they have been present, how severe they are, and if they have ever been treated before  
• Past and current medical conditions  
• Alcohol and drug use  
• Family medical history  
• Family psychiatric history, especially as pertains to blood relatives who have or who have had depression  
• Whether suicide has ever been considered or attempted