People are not so easily pigeon holed. There are many diseases that manifest themselves in various parts of your body or affect different organs. If your doctor explains why these diseases or illnesses make you disabled, it does not matter which one is the most disabling. Disability is somewhat holistic—the doctor looks at you as a person not as a particular disease. If a combination of disorders makes you disabled, so be it. The treatment of a primary disease often causes unwanted side effects—even medications or treatments can add to your disabilities. Everyone is unique and it is common to have more than one symptom of disability.