Pain in the lower left rib cage is usually due to the stomach, which is under the left rib cage. When there is gastritis, gastric ulcer and other diseases, it may lead to pain under the left rib cage, and also pay attention to exclude whether the pain is caused by the rib cage itself; liver and gallbladder are mainly located under the right rib cage, and liver and gallbladder related diseases may cause symptoms of discomfort under the right rib cage or upper abdomen. Further gastroscopy, hepatobiliary ultrasound and liver function tests are recommended to clarify the diagnosis and give appropriate treatment. If there is a history of related gastric diseases in the past, it may also be possible to give symptomatic treatment with gastric medicine to see if the symptoms can be relieved.