Left chest pain in women is commonly caused by the following diseases: 1, angina pectoris, myocardial infarction, such as congenital heart disease, myocardial ischemia, heart valve disease, etc., may cause chest pain. It is recommended to check electrocardiogram and cardiac ultrasound for identification.2. Breast hyperplasia and acute mastitis can also cause left breast pain, and breast disease is recommended to perform breast ultrasound for further exclusion.3. Lung infection, pneumothorax, pulmonary abscess chest and lung tumor can also cause left chest pain, and it is recommended to perform CT examination of the lung to further clarify the diagnosis. Left chest pain is also seen in mediastinal tumors, rib neuralgia, etc.