Rheumatic diseases are a group of diseases, and rheumatic fever is a type of rheumatic disease. Rheumatic diseases are a group of diseases that mainly affect joints, bones, muscles, blood vessels and surrounding soft tissues or connective tissues, most of which are autoimmune diseases with insidious onset and long duration, most of which have genetic predisposition. Rheumatic fever is associated with group A beta-hemolytic streptococcal infections and occurs mainly in school-age children and adolescents, manifesting as fever. The heart may be involved, and there may be erythema annulare of the trunk and proximal extremities or painless subcutaneous nodules. Involvement of the extrapyramidal system may result in chorea, which is characterized by squeezing of the eyebrows, tongue extension, blinking, shaking of the head, etc., and a significant increase in blood anti-O titer.