Benign endocarditis is an acute or subacute infectious disease characterized by an inflammatory process in the membranes of the heart, the formation of abscesses in them and a tendency to develop embolisms of infectious etiology. Benign endocarditis is characterized by general malaise, fever, weakness, sweating, refusal to eat, headache, nausea and vomiting. If there is no increase in the symptoms of acute infection accompanying the development of endocarditis, then it can proceed unnoticed for a long time. Any inflammatory processes will be sluggish, may disappear completely or become chronic in case of late diagnosis. The endocardist will complain of a rapid heartbeat, sometimes chest pain and shortness of breath during exercise.