Men’s left breast muscle throbbing is divided into physiological and pathologic, such as calcium deficiency, heart substantial lesions and so on. 1. Physiological: it may be normal apical beat, generally thin chest wall or widening of the rib gap when the left breast beating is more obvious; it may be local muscle spasm, generally after strenuous activities or overwork, resulting in excessive pressure on the heart, the left breast area muscle beating enhancement, alleviate or disappear after rest. 2. Calcium deficiency: Calcium deficiency can cause localized muscle spasms, leading to throbbing in the left breast area, and blood electrolyte test can make a clear diagnosis. 3. Substantial cardiac lesions: such as dilated cardiomyopathy, hypertrophic cardiomyopathy, etc., which can lead to abnormal beating of the heart, externally manifested as abnormal beating of the muscles in the left breast area, and can be clearly diagnosed by electrocardiography and ultrasound examination of the heart. After eliminating the physiological causes of the disease, we should seek medical treatment in time and follow the doctor’s instructions after identifying the causes of the disease, in order to prevent the delay of the disease.