Rebound pain in the lower abdomen is most often seen when intra-abdominal organ lesions involve the adjacent peritoneum and also in primary peritonitis. Rebound pain is a sign of inflammatory involvement of the peritoneal wall and is most often seen in cases of intra-abdominal organ disease involving the adjacent peritoneum and primary peritonitis. So, what are the differential diagnoses of lower abdominal rebound pain? The following is a brief introduction: pressure pain in the right lower abdomen is one of the symptoms of acute appendicitis. Acute appendicitis is the first of all acute abdominal diseases in the common surgical condition. Postpartum lower abdominal cramping or vaginal swelling is a manifestation of uterine involution, the degree of uterine involution varies, the milder one can only show postpartum lower abdominal cramping or vaginal swelling, the more severe one can cause painful shock. Dull pain and soreness in the lower abdomen is one of the clinical manifestations of interparietal hernia, a special form of inguinal hernia characterized by the fact that the abdominal organs do not descend through the ventral femoral canal but protrude between the layers of the abdominal wall via the intra-abdominal ring. Soft salami-like masses can be palpated in the right lower abdomen: cecum granulomas are cecum amebic granuloma and ileocecal schistosomal granuloma. Cecum amebic granuloma is a complication of chronic colitis caused by Entamaeba histolytica E (Entamaeba histolytica). Schistosomiasis granuloma of the ileocecal region is an advanced lesion of intestinal schistosomiasis in which the site of deposition of schistosomal eggs is mainly in the terminal ileum in addition to the colon. The clinical symptoms are limited abdominal pain and intermittent diarrhea, and a soft, salami-like mass can be palpated in the right lower abdomen. Rebound pain rebound tenderneg with a finger in the abdomen slowly downward pressure, pressure pain (or can be no pressure pain), the finger in place for a moment, and then quickly remove the finger, feel the original abdominal pain increased or appear severe pain. This is a sign of inflammation involving the peritoneal wall layer. It is mostly seen when intra-abdominal organ lesions involve the adjacent peritoneum, and also in primary peritonitis.