Cough can cause pain in the right lower ribs, cough belongs to the defensive reflex, the reflex process requires muscle involvement, and the muscles involved in the cough action include intercostal muscles and diaphragm, cough occurs, intercostal muscles and diaphragm will occur contraction and diastolic movement, so that the pressure in the chest cavity to produce a change in the pressure, which causes rapid airflow, and with the muscles of the pharynx, coughing action occurs. Therefore, coughing causes right lower rib pain, mainly including three situations: 1, intense and frequent coughing, resulting in frequent contraction and diastolic movement of intercostal muscles, causing muscle fatigue, resulting in right lower rib pain. 2, intense coughing, resulting in tendon muscles undergo tonic contraction, which can strain the ribs, and in severe cases, leading to rib fracture, resulting in right lower rib pain. 3, intense and frequent coughing, resulting in diaphragm fatigue, and the diaphragm is located under the ribs, so the symptoms of right lower rib pain can also occur.