There are eight causes of right lower abdominal pain as follows: First, the most common cause is chronic inflammation of the abdominal cavity, which is commonly caused by chronic gastroenteritis, cholecystitis, appendicitis, and inflammatory bowel disease. Second, right lower abdominal pain caused by perforation or rupture of abdominal organs, such as rupture of liver and gall bladder, rupture of spleen, rupture of right ectopic pregnancy and other cases. Third, right lower abdominal pain caused by obstruction, blockage or dilatation of organs in the abdominal cavity, such as right large intestinal obstruction, right inguinal hernia. Fourth, the right lower abdominal pain caused by stones, such as the right kidney stones, right ureteral stones, etc. Fifth, intra-abdominal organ twisting caused by diseases such as female right ovarian cysts twisting, intestinal torsion. Sixth, acute infarction caused by obstruction of mesenteric artery by intra-abdominal vessels, such as mesenteric artery thrombosis. Seventh, indigestion caused by gastrointestinal motility disorders can also cause vague pain in the right lower abdomen. Eighth, diseases of the abdominal wall will also have vague pain in the right lower abdomen, such as abdominal wall abscess, abdominal wall trauma and abdominal contusions.