Hidden pain below the left rib cage after sitting for a long time may be caused by extrusion, or it may be caused by pleurisy, cholecystitis and other diseases, as well as other diseases such as costochondritis. 1. Extrusion: When the patient is sitting for a long time and has the symptom of sitting for a long time and having hidden pain under the left rib cage, it may be that sitting for a long time causes the patient’s rib cage to be repeatedly extruded, which leads to the phenomenon of pain. 2. Pleurisy:Pleurisy has various causes, mainly caused by bacterial, viral and other pathogens. Patients will have chest pain, chest tightness, fever, fatigue and other symptoms, pleurisy will also lead to patients with loss of appetite, anemia and other symptoms. 3. Cholecystitis:Cholecystitis is mainly due to biliary obstruction, biliary stasis and other infections caused by the patient’s main symptoms are epigastric pain, nausea, anorexia and so on. Patients with cholecystitis also have symptoms such as abdominal muscle stiffness and jaundice. 4. Other: costochondritis, gastritis and other diseases can also cause patients to sit for a long time the phenomenon of hidden pain below the left rib cage. When the patient appears to sit for a long time the symptoms of hidden pain below the left rib cage, it may be a normal physiological phenomenon caused by extrusion, do not need treatment. If it is caused by disease, the patient should consult a doctor in time and follow the doctor’s advice.