40~50 years old heart is not good, may be due to coronary heart disease, arrhythmia, cardiomyopathy, heart valve disease, etc., the performance of the main cyanosis, dyspnea, chest tightness, chest pain, palpitation, edema, fainting, other symptoms also include cough, headache, dizziness, epigastric distension, nausea, vomiting and so on. 1. Coronary heart disease: mainly myocardial ischemia caused by coronary atherosclerosis, the main symptoms include chest pain, chest tightness, dyspnea, cyanosis and so on. 2. Arrhythmia: mainly manifested as palpitations, feeling abnormal heart rate rhythm, some may have dizziness, fatigue and other symptoms, and severe cases may have fainting. 3. Cardiomyopathy: what kind of heart failure symptoms are caused by myocardial lesions, which commonly include exertional dyspnea, edema, abdominal distension, nausea, vomiting and so on. 4. Heart valve disease: heart valve lesions, causing abnormal blood flow, the performance of the main blood pressure, dizziness, headache, peripheral vascular pulsation weakened. If you are 40-50 years old and have heart disease, you should go to the hospital in time to get a clear diagnosis and active treatment so as not to delay your condition.