Your doctor will diagnose depression on the basis of common signs and symptoms.
A special questionnaire may be used for evaluation.
Your doctor will also ask about any drug or alcohol abuse, or physical illnesses that may have led to depression.
In chronic depression, your doctor may refer you to a psychiatrist, who will look into your health issues, home and work environments, loss of job, marital discord, or experiences that may have had a bearing on how you feel about yourself and others.
Blood tests may be considered for female patients, when there is a suspicion of hormonal disorder.