Abdominal wall hernia is caused by the protrusion of abdominal organs along with the peritoneum through weak spots or openings in the abdominal wall. It can occur at any age and is most common in inguinal hernias (the junction of the thigh and abdomen). Other types include femoral hernia, umbilical hernia, linea alba hernia, incisional hernia, etc. Normal people have some weak areas on the abdominal wall, such as inguinal canal, femoral ring. In addition, some people have developmental defects in certain parts of the abdominal wall, such as incomplete closure of the umbilical ring, defect in the abdominal white line, etc. There are also surgical incisions, abdominal wall injuries caused by trauma, and senile muscle atrophy causing weak abdominal wall muscles, which are predisposing factors for abdominal wall hernia.
An increase in intra-abdominal pressure, such as chronic cough, constipation, difficulty in urination, infants often crying, lifting heavy objects, vomiting, etc., increases intra-abdominal pressure, which pushes the abdominal organs through the weak spots of the abdominal wall out to form a small pocket-like sac called a hernia sac. Most organs can return to the abdominal cavity and are called reducible hernias, while some need to be gently pushed back. Some abdominal wall openings are small, and the abdominal organs pushed out cannot return and are called incarcerated hernias; some compress the blood vessels, causing only the protruding organs to become ischemic and are called strangulated hernias. Strangulated hernias can cause necrosis of the protruding organs. If the protruding object is an intestinal tract, it can cause intestinal obstruction, intestinal necrosis, perforation, peritonitis, etc. It can also break through the abdominal wall to form a fecal fistula. After the formation of the hernia, as the organs repeatedly protrude, the hernia sac gradually expands.