Rib pain below the breast is commonly caused by the following diseases: rib injury, shingles, lung lesions, etc. 1. Rib injury: If the ribs are traumatized, it will lead to rib injury or even lead to rib fracture, and the patient will feel pain in the ribs, which will be aggravated by pain or deep breathing. 2. Herpes zoster: it is caused by the infection of varicella zoster virus, the rash will appear on the skin at the ribs, and the patient will feel the pain in the ribs, and the pain will be relatively intense. 3. Lung diseases: if pneumonia, lung tumors and other diseases occur, when the lesions are close to the ribs, it will lead to rib pain. In addition, some breast diseases may also lead to rib pain below the breast. It is recommended that patients go to the hospital to improve the relevant examinations, such as CT of the lungs, etc., combined with clinical symptoms and physical examination, usually able to make a clear diagnosis.