Depressive illnesses, even the most severe cases, are highly treatable disorders. As with many illnesses, the earlier that treatment can begin, the more effective it is and the greater the likelihood that a recurrence of the depression can be prevented.
The first step to getting appropriate treatment is to visit a doctor. Certain medications, and some medical conditions such as viruses or a thyroid disorder, can cause the same symptoms as depression. In addition, it is important to rule out depression that is associated with another mental illness called bipolar disorder. A doctor can rule out these possibilities by conducting a physical examination, interview, and/or lab tests, depending on the medical condition. If a medical condition and bipolar disorder can be ruled out, the physician should conduct a psychological evaluation or refer the person to a mental health professional.
The doctor or mental health professional will conduct a complete diagnostic evaluation. He or she should get a complete history of symptoms, including when they started, how long they have lasted, their severity, whether they have occurred before, and if so, how they were treated. He or she should also ask if there is a family history of depression. In addition, he or she should ask if the person is using alcohol or drugs, and whether the person is thinking about death or suicide.