Myositis is a generic term for a class of aseptic inflammation involving the muscles. This type of inflammation can be caused by a variety of reasons and can have different prognoses due to different causes. The inflammation in this area is caused by several reasons: 1. It may be caused by muscle-related injuries, such as strains of the muscle caused by the patient during strenuous activity, or by direct violent blows to the muscle, resulting in sterile inflammation here. At this time, the patient will have muscle pain and soreness and weakness. This type of symptom is often relieved by adequate rest, but some patients will be overworked, resulting in muscle lysis of the transverse muscle, which can lead to a series of serious complications. 3, may also be caused by autoimmune reactions, such as patients with local infections, or upper respiratory tract infections, may stimulate excessive autoimmune reactions in the body, attacking the muscle, and then produce a muscle. This type of lesion is relatively difficult to treat, and the symptoms and prognosis are relatively heavy or poor.