Painful pulling under the breast is often seen in breast diseases, such as mastitis, breast hyperplasia; it may also be chest wall diseases, such as chest wall infections. 1. Mastitis: for example, acute mastitis, the onset of the disease, affected by the causative factors, resulting in the blockage of the milk ducts, easy to appear breast pulling pain, and accompanied by nipple redness, swelling, fever, lumps and other symptoms. 2. Breast hyperplasia: the more common symptoms of this disease are breast pain, hard nodules, when the hard nodules and lumps gradually increase in size, they will pull to the lower part of the breast, thus causing pulling pain. 3. Chest wall infections: soft tissue inflammation of the chest wall, lymphadenitis and pleurisy may cause pain under the breast, but not breast lesions. There may be other reasons for the pulling pain under the breast, such as breast cancer, etc. It is recommended to consult the doctor and analyze the cause of the pain before treatment, so as to avoid delaying the condition.