The human body’s left chest pain is seen in the following reasons: first, myocardial ischemia caused. Especially middle-aged and elderly patients, with a history of coronary atherosclerosis or diabetes, hypertension, hyperlipidemia and other diseases. After exertion, catching a cold, emotional excitement can lead to the onset of myocardial ischemia, the left side of the chest pain. In severe cases, there will be oppressive pain radiating to the back of the left shoulder, accompanied by chest tightness, palpitations, nausea, vomiting and other manifestations. Nitrate drugs should be given in time to relieve the symptoms. Secondly, patients with breast hyperplasia will also show pain in the chest and breasts, and there is a certain regularity. Especially in the pre-menstrual period is obvious, will be manifested as a lump in the breast. Mild patients can be followed up and observed regularly, and in serious cases, oral lactic acid tablets and other medications can also be chosen.