Some diseases can be helped with medicine. Infections can often be cured by antibiotics, though resistance to antibiotics is a problem. Some disease may be helped by surgery. Not every disease can be helped with medicine or surgery, though. Some diseases must be treated during the whole life; they are "chronic" (long-lasting) diseases. An example of a chronic disease is diabetes mellitus. Diabetes can be treated (made better) but it can not yet be cured (made to totally go away). People who usually treat diseases are called doctors or physicians.