Pain below the left rib cage, located in the upper abdomen, consider the following two problems. First, problems with the stomach or colon, such as gastritis, intestinal lesions, and irregular bowel movements, can cause pain in the location below the ribs. You can clarify whether there are problems with the colon or stomach by coming to the hospital for a carbon 14 breath test, or by doing a colonoscopy. Second, clear pressure pain in the location of the rib cage, consider chondromalacia or intercostal neuralgia, which are more common causes. The location is relatively fixed and has a certain relationship with activity or pressure. Local pain can be relieved by topical pain relief creams or oral pain medications. However, a chest radiograph is usually needed before diagnosis to rule out intrapulmonary or pleural lesions.