The rib cage is what is known medically as the rib cage. There are more diseases that can cause pain under the rib cage, including trauma, inflammation of the intercostal nerves, and specific organ tissue diseases (such as pancreatitis, gallstones, heart disease, etc.). The ribs that make up the thorax can all be referred to as the rib cage. Within or beneath it are the lungs, pleura, heart, great vessels, intercostal nerves, liver, gallbladder, pancreas, spleen, duodenum, colon, and other tissues and organs. When there is a lesion or injury to the rib cage, it may manifest as rib pain. The nature, duration, and triggering factors of the pain manifested by each tissue and organ lesion are different and need to be identified. For example, pneumothorax is a sudden stabbing or pins-and-needles pain that occurs during strenuous exercise or emotional excitement; myocardial ischemia, which manifests as angina pectoris, may be painful for a few minutes during heavy physical activity and can be relieved after rest; gallstones cause paroxysmal spasm-like pain that can last for a long time. Myocardial infarction is a pain with a sense of near death that lasts for more than half an hour without relief; aortic coarctation is a pain like cutting and tearing; pancreatitis, etc. may manifest as distension and pain, possibly with nausea and vomiting. Combined with the above, the pain below the rib cage may be a lesion of the large blood vessels of the heart, or intercostal neuralgia, pneumothorax, or gallstones, pancreatitis and other diseases.