Rheumatic fever is a complication of strep throat caused by Streptococcus bacteria. This fever is a serious disease because it can have fatal effects on health, such as permanent damage to the heart and stroke, even death. Rheumatic fever occurs because the body is infected with group A. Streptococcus. This bacterium initially causes inflammation of the throat. If not treated properly, there is a possibility the body has rheumatic fever due to the influence of an abnormal immune or immune response. In rheumatic fever, the immune system attacks normal body tissues and eventually causes inflammation in other parts of the body. Dangers of Rheumatic Fever Perhaps many people who do not think that strep throat can have this serious illness, especially if it can be life threatening. Rheumatic fever is a rare disease. The disease can occur at any age, but it is more experienced by children aged 5-15 years. You should be wary if you experience strep throat accompanied by fever, painful