The common causes of vague pain on the left side of the chest in women are as follows: 1, coronary angina, if the patient appears to have vague pain on the left side of the chest after activity, which lasts for a few minutes and can be relieved, consider that the patient may have angina and needs to be actively treated in the hospital; 2, if the pain is vague, similar to needle-like, and passes in a few seconds, consider that it is intercostal neuralgia; 3, female breast enlargement can also appear vague pain on the left side of the chest; 4, If the patient has recently developed coughing and coughing sputum, and the vague pain is related to breathing, consider that the patient may have lung inflammation or pleural disease, which can also lead to vague pain on the left side of the chest. Therefore, if there is vague pain on the left side of the chest, patients are advised to actively seek medical attention.