Sitting down for a long time with hidden pain in the abdomen may be caused by indigestion, gastrointestinal diseases, and diseases of the urinary and reproductive systems. 1. Indigestion: after eating a meal, the food is not easy to digest and accumulates in the abdomen, so the symptom of hidden pain in the abdomen may occur. 2. Gastrointestinal diseases: when the gastrointestinal lesions, such as appendicitis, colitis, etc. will cause symptoms of hidden pain in the lower abdomen. 3. Genitourinary diseases: when the patient suffers from genitourinary diseases, there will be symptoms of abdominal pain, such as female pelvic inflammatory disease or male prostatitis, etc., due to the stimulation of inflammation, may lead to the patient to appear sedentary abdominal pain symptoms. These are only some of the common causes. When people are in a sedentary environment for a long period of time, they should develop good habits and walk appropriately after meals to avoid symptoms such as food accumulation. If symptoms persist or recur, seek medical attention. After a clear diagnosis, follow the doctor’s instructions to standardize the treatment.