The causes of hidden pain in the lower left last rib include physiologic and pathologic causes. Physiologic causes include left-sided intestinal distension, etc. Pathologic causes include left-sided rib fracture, pleurisy, and costal neuralgia. 1. Physiological causes: The patient’s left side intestinal distension caused by indigestion, which leads to pain in the left lower last rib area, and also accompanied by bowel dysfunction, such as constipation. 2. Pathologic causes (1) Usually, the common pathologic cause of pain in the lower left last rib is left rib fracture, which can be easily caused by blows to the ribs and accompanied by symptoms of dyspnea; (2) If suffering from pleurisy, common symptoms include chest pain, and some patients also have left-sided rib pain; (3) If you suffer from intercostal neuralgia due to infection, exertion, etc., it can lead to hidden pain in the last rib on the lower left side. There are many reasons for the pain in the left lower last rib, you should go to the hospital in time for examination, clear the cause of the disease and then timely treatment, so as not to aggravate the condition.