Hidden pain on the right side of the abdomen may be caused by indigestion, chronic appendicitis, liver and gallbladder diseases, kidney and ureter diseases or intestinal tumors. 1. Dyspepsia: It is common for patients to have irregular diet, overeating, eating spicy, cold and hard food, which leads to gastrointestinal dysfunction and vague pain on the right side of the abdomen or pain around the umbilicus. 2. Chronic appendicitis: chronic appendicitis is often manifested as vague pain in the right lower abdomen, which can be triggered by exertion or cold. 3. Hepatobiliary diseases: gallbladder stones, cholecystitis, hepatic parasitic diseases, liver tumors, etc. can cause vague pain in the right side of the abdomen. 4. Renal and ureteral diseases: common diseases such as pyelonephritis, ureteritis, renal tuberculosis, renal stones or ureteral stones, etc., all of which can cause vague pain on the right side of the abdomen. 5. Intestinal tumors: a few people are caused by intestinal tumors, which will show hidden pain in the abdomen in the early stage, accompanied by blood in stool or black stool. Besides, female adnexitis and adnexal tumors can also lead to vague pain on the right side of the abdomen. Warm tips: If you find that you are not feeling well, you must consult a doctor in time, so as not to delay the condition and affect the treatment.