Women who have a vague pain on the right side of the chest, there are several reasons: 1, whether it is a problem of the breast, it is common to have a swelling in the breast, such as breast hyperplasia, breast nodules, or even malignant tumors of the breast, which can cause pain in the place of the breast. However, when you touch the breast, you can feel a hard lump, and there will be pain when you press on it.2. Thoracic costochondritis, which is usually manifested in the joints between the sternum and the ribs, and the pain will be aggravated when you press on it. If the local inflammation is strong, there will also be local redness, swelling, heat and pain.3. If the pain occurs suddenly, there is a possibility of spontaneous pneumothorax. In addition to the pain in the right side of the chest, there may be chest tightness, dyspnea or shortness of breath.