<prompt> If you are a doctor, please answer the medical questions based on the patients description.My 10 yr. old son, 63 pounds, has had vomiting and extreme abdominal pain for 24 hrs with 2 more days of just abdominal pain. No fever. 4 days later he had a rash only on his cheeks then 2 days later the rash spread to different patches on his arms and legs. Dr. put him on prednizone and the rash seemed to go away. 1 day after last dose of the prednizone it started again with the vomiting only for 24 hrsand again 3 days of tummy pain for 2 more days. No fever again. There was about 3 weeks in between each of the the vomiting but the rash has been their for about 2 weeks sometimes very itchy. Theyve done xrays, taken blood work to see if hes allergic to any respitoryfood allergy, urinealisis, and just regular blood work. Please help  <response>: Hi. The recurrent pain in abdomen, vomiting and body rash is indicative of the following : Since your son is just 10 years old you have to give him tablets for the intestinal worms. -Another cause can be mesenteric lymphadenitis, this being common in this age group. Ultrasonography will confirm this and also help to rule out appendicitis or other causes. - If necessary CT scan of the abdomen may help.Blood-complete blood picture, kidney functions tests, blood sugar fasting and post-lunch, Urine-routine, microscopy, culture and sensitivity before start of antibioticUltrasonography of abdomen. Once a proper diagnosis has been made, the treatment is an easy thing to do. 