Patients with chronic myocarditis will show different symptoms according to the time of onset and different degrees of damage to the heart; patients with chronic myocarditis are mainly characterized by cardiac symptoms; patients may have cardiac symptoms such as chest tightness in the precordial region, chest pain, panic, palpitations, and shortness of breath; the whole body feels weak in all four limbs, fatigue, easy to sweat, and even fainting. Chronic myocarditis is a more common heart disease caused by limited or diffuse inflammation; chronic myocarditis may have no discomfort or mild symptoms in the early stage, and most of the patients are accompanied by fatigue, chest tightness, panic, palpitations, and a few of the patients may have hidden pain in the precordial area and other symptoms. As the disease progresses, the discomfort worsens, and some patients experience severe symptoms such as chest tightness, shortness of breath, sitting breathing, dyspnea, etc. In severe cases, loss of consciousness or sudden death may even occur. Once the above mentioned symptoms occur, please consult a doctor at the first time to clarify the relevant diagnosis and follow the doctor’s instructions for treatment.