Pressure pain, rebound pain, and muscle tension are usually clinical manifestations of abdominal pain that facilitate rapid identification and diagnosis of the disease by the physician. When inflammation occurs in the abdominal cavity due to bacterial or viral infection, if the inflammation is not severe there is usually only pressure pain, but when the inflammation involves the parietal lobe of the peritoneum there will be pressure pain and rebound pain, as well as clinical symptoms of abdominal muscle tension, some of which are accompanied by nausea, vomiting and fever. In this case, it is recommended to go to the hospital in time for examination to determine whether it is primary peritonitis or secondary peritonitis due to rupture, perforation, postoperative contamination of certain organs in the abdominal cavity, etc., and then treat the cause according to the symptoms. Because peritonitis can cause intestinal obstruction in severe cases, and can also cause the possibility of damage to multiple organs such as the intestines, liver and kidneys, and can even be life-threatening, it is recommended to seek medical attention promptly when symptoms such as abdominal pressure pain, rebound pain and muscle tension occur.