Common causes of Chronic abdominal pain
In adults the common cause of chronic abdominal pain: Carcinoma
In children, the common cause of chronic abdominal pan: Irritable bowel syndrome
References:
1. Chronic Abdominal pain in children. Pediatrics 2005;115;812
2. Chronic Abdominal pain. Kapural 2015. ISBN: 9781-4939-1991-8