Left shoulder seam pain in women may be caused by cervical spondylosis and frozen shoulder, or it may be a precursor symptom of angina or myocardial infarction, tumor and other diseases. 1. Cervical spondylosis and frozen shoulder: women who have their heads bowed for a long time due to work may be at risk of cervical spondylosis, which may compress the peripheral nerves and cause pain in the left shoulder crease. Or if the patient works for a long time or does not pay attention to keep warm, it may cause inflammation of the shoulder joint and cause pain. 2. Angina pectoris or myocardial infarction: some patients in angina pectoris or myocardial infarction before the attack, may appear in the left shoulder area involving pain, accompanied by chest tightness and shortness of breath and other precursor symptoms, the initial stage of the disease may appear chest tightness, chest pain and other symptoms, the disease is typically manifested in the precordial area of the sense of weight bearing or compression pain. If the patient has the above symptoms at the same time, it suggests that angina pectoris or myocardial infarction may occur. 3. Tumor: If the patient’s left shoulder develops tumor, there will be the symptom of left shoulder pain. If the patient is accompanied by upper limb activity limitation, local lumps, etc., it may be the development of tumor; if the patient is accompanied by pain and bleeding in other parts at the same time, it may be caused by metastasis of other tumors. Women’s left shoulder pain may be caused by other diseases, or it may be the precursor of heart disease or tumor, patients need to go to the hospital in time for examination, to clarify the cause of the disease and then deal with it accordingly.