Hidden pain 3~5 centimeters below the right side of the belly button may be caused by: chronic appendicitis, Crohn’s disease, ascending colon cancer, intestinal tuberculosis, female pelvic inflammatory disease and so on. 1. Chronic appendicitis: most chronic appendicitis is the extension of acute inflammation, a few patients can also be chronic inflammatory reaction. Patients mainly manifested as discomfort or hidden pain in the right lower abdomen, strenuous exercise or unclean diet can trigger an acute attack of inflammation, manifested as obvious pain in the right lower abdomen, fever and so on. 2. Crohn’s disease: Crohn’s disease is a kind of autoimmune inflammatory bowel disease, which mostly involves the end of ileum and neighboring colon, and the patient manifests intermittent episodes of right lower abdominal pain, mucous blood stool, urgency and heaviness, and part of the patient can find a mass in lower abdomen. 3. Ascending colon cancer: there are no obvious clinical symptoms in the early stage of ascending colon cancer, and it can have non-specific manifestations such as lower abdominal discomfort, hidden pain and change of bowel habit. 4. Intestinal tuberculosis: Intestinal tuberculosis mostly involves the ileocecal part, which mainly manifests as recurrent intermittent pain in the right lower abdomen, relieved after defecation. Accompanied by abdominal distension, diarrhea, bowel sounds and other symptoms. Patients with diarrhea have mushy stools, which can also manifest as alternating diarrhea and constipation. 5. Women’s right-sided pelvic inflammatory disease: including tubal inflammation, ovarian inflammation, pelvic peritonitis and other diseases can cause women’s chronic right lower abdominal pain. Persistent lower right abdominal pain suggests that patients go to the hospital as soon as possible, identify the cause of the disease in a timely manner to be treated accordingly.