Women need to exclude coronary heart disease, pleurisy, intercostal neuralgia, breast disease and other diseases on the left side of the subcostal pain. 1. Coronary heart disease: a relatively common cardiovascular disease, with coronary artery vasospasm or stenosis, especially angina pectoris or myocardial infarction, the main clinical manifestations of the left side of the chest or the left side of the chest pain, precordial discomfort and chest tightness and so on. 2. Pleurisy: it is an infectious disease that occurs in the pleura, which can be manifested as localized pain and aggravated by deep breathing or coughing. 3. Intercostal neuralgia: the intercostal nerves are damaged due to various reasons, which can be manifested as localized burning sensation, tingling sensation or hidden pain. 4. Breast diseases: such as breast fibroma, mastitis, breast tumor, etc., which may also cause left subcostal pain and discomfort. The above are only some of the common causes. Due to the complexity of the causes, it is necessary to have a doctor’s consultation to analyze the specific situation.