Children with pain one inch below the navel may be due to mesenteric lymphadenitis, intestinal obstruction and other diseases. 1. Mesenteric lymphadenitis: it is caused by virus, parasite, bacteria or mycoplasma infection. Typical symptoms include fever, nausea, abdominal pain, etc. Abdominal pain can occur in any part of the body, and it is common in the right lower abdomen, so some children will have pain one inch below the navel. 2. Intestinal obstruction: the causes of this disease include intestinal torsion, fecal stone blockage, intestinal adhesions, etc. It may also be caused by mesenteric vascular embolism and other reasons. Common symptoms include abdominal pain, vomiting, abdominal distension, etc. As the location of intestinal obstruction is different, so the location of abdominal pain also varies, therefore, some children will have pain one inch below the navel. In addition, the causes of pain one inch below the navel in children are lactose intolerance, acute enteritis, indigestion and so on. To summarize, children with pain one inch below the navel need to go to the hospital in a timely manner to determine the exact cause.