Hi. Thanks for your specific query, although you would have provided information about associated fever, bowel habit change any urinary complaints. The commonest cause can definitely be appendicitis or typhlitis ( inflammation of the caecal part of colon on right side where the small intestine and appendix are connected). I would advise you the following: Get a check-up done by a Surgeon, *Routine blood investigations like Complete blood picture, blood sugar, urea, creatinine, liver function tests, thyroid function tests. *Urine -routine and microscopy *Stool: routine, microscopy, occult blood, culture and sensitivity. *Ultrasonography of abdomen, *Colonoscopy if the medical treatment fails to relieve you. Get the surgery done if it is appendicitis.