Rheumatic fever is an inflammatory condition. It involves the connective tissue in the body. The most severe complication is rheumatic heart disease. This condition may permanently damage the heart valves. Valves control the flow of blood to and from the heart.

Diseased Heart Valve
Diseased Aortic Valve
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Rheumatic fever is caused by group A Streptococcus pharyngitis, also known as strep throat. In this case, the body uses antibodies to fight the infection, but the antibodies also attack the heart.