Some chronic myocarditis is asymptomatic, while some chronic myocarditis may present with easy fatigue, palpitations, chest tightness, chest pain, arrhythmia, etc. In addition, dyspnea and decreased activity tolerance may occur during exercise. 1. Mild chronic myocarditis usually has no obvious symptoms and does not show obvious abnormalities on examination. 2. Chronic inflammation affects myocardial function, manifesting as weakness, easy fatigue, palpitations, chest tightness, chest pain, arrhythmia, etc. Symptoms become more obvious after strenuous exercise or exertion, with dyspnea and decreased activity tolerance, and, as the disease develops, it also leads to loss of appetite, abdominal distension, and lower extremity edema. If chronic myocarditis is suspected or uncomfortable symptoms occur, you should seek medical attention as soon as possible to confirm the diagnosis based on a combination of medical history, examination, and clinical symptoms without delay.