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Myositis, like every other disease brings not only negative emotional sufferings but also significantly undermine the health of its carrier. This disease is not widespread. What happens to the organism is that “the immune system chronically inflames the muscle tissue of the body”. The inflammation does not only touch the muscles fibers but also the skin of the sick person. Myositis may include such illnesses as: polymyositis, dermatomyositis and inclusion body myositis. Polymyositis is the stage of muscle inflammation and the stage when myositis starts attacking the skin is called dermatomyositis. The major problem concerning myositis is the difficulty to determine the irritant triggering such behavior and harmful reaction of the immune system in each individual situation. If the inflammation happens over and over the muscles of the body lose their tonus. They become weak, making it very hard to move the parts of the body. It is not a disease that appears suddenly. The development of the disease is rather slow and that it why the symptoms do not start to disturb on early phases. Myositis is suffered by the age categories starting from childhood, between the ages of 5 and 15 and strikes adults between the ages of 30 and 60. There are also no gender peculiarities, as it touches both men and women.