Manic-Depressive illness is also known as bipolar disorder. This is a severe medical illness that can affect your life in crucial ways. Some people are able to read information about the disease and know they have it while others may need to a have help deciding if they are affected by a doctor. Medical tests are still not available for detecting manic-depressive illness. So, it can be very tricky discovering whether you suffer from it or another mental illness with similar symptoms. Bipolar Disorder is a brain disorder and has many serious signs and symptoms you can look for.