Some people become depressed for a combination of reasons. For others, a single cause appears to trigger depression. Some become depressed for no apparent reason. Regardless of the cause, depression needs to be diagnosed and rated. Strokes, certain types of cancer, diabetes, Parkinson's disease, and hormonal disorders are examples of illnesses that may be related to depressive disorders.
Some medicines cause depressive symptoms as side effects.
Certain drugs used to treat high blood pressure and arthritis fall in this category. In addition, different drugs can interact in unforeseen ways when taken together. It is important that each doctor know all the different types and dosages of medicine being taken and discuss them with the patient. For a proper diagnosis, it is important to have a thorough medical examination to rule out other disorders. Children of depressed parents have a higher risk of being depressed themselves.