The causes of pain under the edge of the ribs on the left side of the raphe may include chest diseases, gastroesophageal diseases, heart diseases and so on. 1. Chest diseases: such as intercostal neuritis, the pain is presented as severe burning or pinprick pain, radiating pain from the back to the front and down; rib fracture, often with a history of trauma, the fracture site and the surrounding soft tissue pain is obvious. 2. Gastroesophageal diseases: such as gastritis, gastric ulcer, reflux esophagitis, part of the stomach is located under the left side of the ribs under the xiphoid process, and if chronic or acute inflammation occurs in this part of the stomach, it can also lead to pain in this area. Patients also have nausea and vomiting, loss of appetite, acid reflux and heartburn. 3. Heart disease: angina pectoris, myocardial infarction, pericarditis, etc., manifested as pain in the anterior region of the heart, which may radiate to the abdomen, manifested as pain in the left side of the lower ribs, accompanied by panic, shortness of breath and other symptoms. If the patient has the above symptoms, it is recommended to consult the doctor for examination in time so as not to delay the treatment.