Rheumatic heart disease, in the early stages of onset, can present with fever. The main cause of rheumatic heart disease is due to an infection with streptococcus that causes damage to the heart valves. Initially, bacterial infection is the most prominent clinical manifestation, with common diseases like tonsillitis. If effective medication is applied to control the infection at this time, it can reduce the occurrence of rheumatic heart disease. If not treated promptly, it can lead to damage to the heart valves, resulting in rheumatic heart disease.