Myocardial weakness usually has the following causes: 1, insufficient blood supply to the myocardium: patients with coronary heart disease, or atherosclerosis of the coronary arteries or the formation of thrombus can lead to narrowing of the coronary arteries and insufficient blood supply, which can lead to damage to the heart and myocardium in the long term and can lead to myocardial weakness; 2, congenital diseases: congenital dilated heart disease, myocardial hypertrophy caused by; 3, heart failure, myocardial disease: in Lack of nutrition or lack of blood supply, compensatory myocardial hypertrophy, narrowing of the heart chambers; 4, long-term stay up late: long-term high load state of the heart, the rupture of the tendons can lead to the loss of myocardium. For myocardial weakness need to identify the cause, if it is bad habits or long-term stay up late, need to actively correct. If it is caused by congenital organic lesions, surgical intervention is required after identifying the cause.