Pain in the ribs below the right breast in women may be caused by the following reasons: 1, it may be caused by costochondritis here, which is often due to cold or some old injury, resulting in inflammation of the rib cartilage, which then causes pain here. trauma, such as direct impact, may cause contusions or even fractures of the ribs, leading to pain; 3, this condition may be caused by long-term pressure, such as long-term prone or right-sided sleeping position, which may cause long-term pressure on this part, leading to inflammation here, which will also cause pain here. This is often more common in older women, who often have severe osteoporosis, and the process of coughing or deep breathing may cause pathological fractures in this area, leading to pain here.