Hidden pain inside the ribs in the left upper abdomen may be a disease of the splenic flexure of the colon, or it may be a disease of the stomach, pancreas, or chest. 1. If there is inflammation or obstruction in the splenic flexure of the colon, it may be manifested as vague pain inside the ribs in the left upper abdomen. 2. If you suffer from chronic gastritis, gastric ulcer, gastric cancer, etc., you may experience epigastric discomfort, fullness and pain. 3. Chronic pancreatitis patients usually suffer from epigastric pain with back pain, which can be manifested as hidden pain inside the rib cage in the left upper abdomen. 4. Angina attacks, usually manifested as precordial or retrosternal pain, atypical patients may be manifested as the left epigastric ribs inside the hidden pain; if you suffer from pleurisy, due to the stimulation of inflammatory factors, may also appear in the left epigastric ribs inside the hidden pain phenomenon. Other rare causes are splenic diseases such as splenic abscess and splenic infarction. It is recommended to go to the regular hospital in time, to clarify the cause of the disease, and to carry out standardized treatment under the guidance of the doctor, so as not to delay the condition.