The tingling under the left breast may be due to temporary fluctuations in endocrine levels caused by recent late nights, nervousness, greasy diet, etc. This is a normal physiological phenomenon and can usually be relieved after rest. If the symptoms are not relieved, it is necessary to consider the influence of disease factors. The first consideration is breast disease, in addition, because there are a variety of organs and tissues under the left breast such as heart, lungs, ribs, rib nerve, etc., after the occurrence of lesions may cause the symptoms of bouts of stabbing pain under the patient’s left breast. 1, breast disease: such as breast hyperplasia, mastitis, breast fibroids in the left breast, etc., mostly caused by the patient’s left breast infection or endocrine disorders, mostly accompanied by pain in the breast department, the 2, neurological diseases: such as intercostal neuritis, if the patient has inflammatory lesions in the intercostal nerve under the left breast, there may also be a burst of stabbing pain under the left breast, mostly aggravated by cold and exertion; 3, other organ diseases: such as pneumonia, coronary heart disease, angina, pancreatitis, pleurisy and other diseases of organs or tissues under the left side of the chest, may cause the patient to have a burst of stabbing pain in the left side of the chest A burst of; 4, skeletal diseases: such as rib fracture, rib cartilage injury, etc., mostly due to trauma to the left side of the chest, causing a burst of stabbing pain, some patients may have bruising, limited activity, pain increases when gasping for air, etc., and need to be sent to the doctor as soon as possible for treatment.