Clinical depression is the state in which the person feels as if he has lost everything and so for understanding the disease better it is necessary to diagnose clinical depression as early as possible. From the diagnosis it will get clear as whether the person has reached the clinical depression stage and if yes then the possible treatment measures can be started to cure the person. If doctor diagnose the patient with clinical depression, then the family members must take complete care of that person as they may develop suicidal tendencies. Clinical depression is diagnosed using two methods namely physical evaluation and psychological evaluation. One method of diagnosing clinical depression is through physical examination and it forms the most essential part of the screening process. Under this several tests are needed to be carried out which can also include test to measure the blood count as well as thyroid test. The doctor may also ask whether the patient is suffering from family history of illness related to mental conditions. Questions may also be asked whether the person is consuming alcohol or drug. If the doctor cannot find any physical symptom.