Some drugs used to treat arthritis, heart problems, high blood pressure, and cancer can produce depression. The effects of these drugs may not always be clear right away. Scientists also think that some illnesses themselves can bring about depression. These include Parkinson's disease, stroke, and hormonal disorders such as thyroid disease. Genetics, too, can play a role.
Studies show that some forms of depression run in families.
Children of depressed parents may be at a higher risk of getting the disease themselves. Depression is the most treatable of all mental illnesses. About 60 to 80 percent of depressed people can be treated successfully. Depending on the case, various kinds of therapies seem to work. Treatments such as psychotherapy and support groups help people deal with major changes in life.