Compulsive lying on the back is a position in which the patient lies on his back with his legs flexed to relieve tension on the abdominal muscles in order to relieve the pain of the disease. It is commonly seen in acute peritonitis. Secondary peritonitis Acute perforation and rupture of intra-abdominal organs: the most common cause of acute secondary peritonitis. Perforation of cavernous organs often occurs suddenly due to progression of ulcerative or gangrenous lesions, e.g., acute appendicitis, peptic ulcer, acute cholecystitis, typhoid ulcer, gastric or colon cancer, ulcerative colitis, ulcerative intestinal tuberculosis, amebic bowel with diverticulitis. The following diseases may also be the cause of forced supine position: 1. Secondary purulent peritonitis Secondary purulent peritonitis (secondary purulent peritonitis) is often caused by acute inflammation of the abdominal organs, acute perforation, visceral rupture, surgical contamination, and other factors. The bacteria causing peritonitis are mostly resident bacteria of the gastrointestinal tract, most commonly Escherichia coli, followed by Streptococcus faecalis, Enterococcus, Aspergillus, Pseudomonas aeruginosa and anaerobic bacteria, so they are mostly mixed infections. Staphylococcus is the main pathogen of peritonitis caused by surgical contamination. In the early stages of peritonitis, peritoneal bacterial invasion or digestive fluid stimulation, on the one hand, mobilizes the body’s defense function and begins to antagonize bacteria and their toxins; on the other hand, gastric juice, bile, blood from ruptured parenchymal organs and necrotic organ tissues from gastrointestinal perforation play an auxiliary role to bacterial infection. 2. Benign Paroxysmal Peritonitis Syndrome Benign Paroxysmal Peritonitis Syndrome is also known as Familial Mediterranean Fever Syndrome, hereditary familial amyloidosis, Seigal- Cattan-Mamon syndrome. The disease is mostly seen in the Mediterranean coastal areas, such as Jews and Arabs in Spain and Portugal, and is more common in adolescents, more males than females, and in children but less common than adults. 3, pediatric secondary peritonitis Secondary peritonitis is an acute inflammation of the peritoneum caused by perforation of intra-abdominal organ inflammation, injury rupture, blood flow disorders, necrosis or surgical contamination. It is the most common clinical acute peritonitis, which may combine many congenital and acquired gastrointestinal disorders, including inflammation, local ischemia or perforation secondary peritonitis is the most common cause of health search in infants and older children is appendicitis; and neonates is necrotizing small bowel colitis; in patients receiving peritoneal dialysis peritonitis occurs on average 1 to 2 times a year. 4. Primary peritonitis in pediatric patients Primary peritonitis (primary peritonitis) includes spontaneous bacterial peritonitis (infection of the ascites occurs, often associated with chronic liver disease or nephrotic syndrome) and peritonitis associated with Mycobacterium tuberculosis, pneumococcal, and Neisseria infections (the latter is likely to occur in prepubertal girls). It is an acute purulent infection caused by the entry of pathogens into the abdominal cavity via blood, lymph or through the intestinal wall or the female genital tract, without an obvious focus of primary infection in the abdominal cavity.