Swelling and pain in the chest may be a breast disease, or it may be related to inflammation of the chest wall or costochondritis. 1. For non-menopausal women, before menstruation, during menstruation, and during pregnancy, estrogen levels are high, and the mammary glands increase, resulting in swelling and pain, which is a normal physiological phenomenon. When there is breast inflammation, breast tumor or cancer, it will also lead to chest pain, and the pain may be in the breast, chest or armpit lymph nodes. 2. Inflammation of chest wall, such as infection of chest wall muscles and soft tissues, will appear red, swollen, hot and painful symptoms, when the inflammation worsens, bone pain, chest pain and other symptoms will appear. 3. Costochondritis is mainly characterized by pain in the chest area, which can radiate to the back and worsen when coughing and deep breathing. There may also be other causes of chest swelling and pain, you should go to the hospital in time to find out the cause of the disease, and take the correct treatment under the advice of the doctor, so as not to delay the condition.