Pain under the left side of the ribs of the stomach is mostly considered to be caused by digestive system diseases and rib lesions. It is recommended to go to a regular hospital for a detailed examination to clarify the cause and then carry out cause-specific treatment. Common causes and treatment 1, digestive system diseases: such as gastric ulcer, acute gastroenteritis, pancreatic diseases, etc., may lead to pain below the left side of the ribs of the stomach, accompanied by other digestive system symptoms, such as abdominal distension, abdominal pain, etc., and the pain increases after eating. Routine examinations, such as barium x-ray and, if necessary, gastroscopy, are needed to further clarify the diagnosis. Treatment is preferred to drug therapy, such as appropriate oral omeprazole capsules, thioglycollate tablets, mosapride tablets and other drugs under the guidance of a doctor; if the pain is caused by pancreatitis, diet therapy and supportive therapy should be given; if it is an acute attack, surgery is needed; usually need to pay attention to rest, regular diet, avoid overeating. 2, rib lesions: If patients have pain symptoms below the ribs on the left side of the stomach, the nature of the pain is mostly stabbing or burning pain, sometimes there may be radiating pain to the back and other areas, coughing, deep breathing or sneezing can make the pain worse, mostly consider local intercostal neuralgia, chondromalacia and other diseases, and need to go to the appropriate department for pain relief treatment.