The good news is that improvement rates for serious mental illnesses like depression and bipolar disorder (also known as manic-depressive illness) rival or surpass those for chronic physical diseases like diabetes and heart disease, provided that the patient receives the right treatment — consistently. The bad news is that an astonishing 80 percent of people in this country with treatable mental disorders do not have their conditions detected in medical or other settings — and even when identified and properly diagnosed, they do not receive effective treatment.