<s>[INST] Hi, my 12 year-old brother has mild abdominal pain in the umbilical region that is localized above the belly button. The pain was felt yesterday about 30 mins after eating fried chicken and dessert that contains milk. Later that night he vomit. Up to this time, he felt mild pain still in the umbilical region accompanied with a 37.7 C of fever and mild headache. He only vomit once. What is it? Could it be gastroenteritis or an early sign of appendicitis? Thank you for your help. [/INST] Hi ! Good morning. i am Dr Shareef answering your query.Yes, this could be a gastro enteritis, but as doubted by you could be an early sign of appendicitis specially a pelvic/post ileal appendicitis. This can be differentiated not without a clinical examination and related investigations. Therefore, I would suggest you to report to the ER of a nearby hospital in your area, so that appropriate diagnosis and management could be instituted.I hope this information would help you in discussing with your family physician/treating doctor in further management of your problem. Please do not hesitate to ask in case of any further doubts.Thanks for choosing health care magic to clear doubts on your health problems. Wishing you an early recovery. Dr Shareef. </s>