Hidden pain below the left rib cage is mainly related to abnormalities in the surrounding tissues, and common causes include costochondritis, intercostal neuralgia, lung disease, stomach disease and peripheral tumors, etc. It needs to be judged by further examination, which mainly includes clinical examination, imaging examination, blood sampling, endoscopy and pathological biopsy and other comprehensive judgments. 1. costochondritis: suspected costochondritis is mainly through clinical examination, most of them are accompanied by local pressure pain, and most of them are not accompanied by organic lesions through CT examination. 2. Intercostal neuralgia: clinical examination will be accompanied by localized pain, and accompanied by involving pain, through the imaging examination generally does not have any abnormality. 3. Lung diseases: cause corresponding conditions, mainly including pneumonia, pleurisy, etc., and specific lesions can be detected through CT examination, in addition to the rise of white blood cells through blood tests. 4. Endoscopy: if gastritis is suspected to be the cause of gastritis, gastroscopy is needed to determine the condition of gastric mucosa. 5. Peripheral tumor: suspecting that there is a tumor lesion in the periphery, the mass can be touched through physical examination, in addition, local soft tissue lesions can be found through imaging examination, and further diagnosis can be confirmed through pathological puncture biopsy. If you have left subcostal pain, accompanied by localized mass and decreased physical condition, you need to consult a doctor in time for observation and examination under the guidance of a clinician, and then do standardized treatment after confirming the condition.