<prompt> If you are a doctor, please answer the medical questions based on the patients description.My daughter is experiencing abdominal pain that was kind of burning right in the middle of her stomach, under her ribcage. She also is light-headed, and she has these involuntary twitches or shakes through-out her body. She does not have a fever. She has been eating differently lately...salads and fruits, and smaller portions and very little bread. She has lost a lot of weight within the last 3 months...maybe 20-30 pounds. She looks great now, and exercises a lot. She was running today, and almost blacked out. She just took pepto, and now that she is laying down...she is doing better. Should I be highly concerned?  <response>: Hi. Thanks for your query and an elucidated history. Yes, This is of a concern and I think needs to be investigated for the sake of ruling out any underlying problem Medical condition which should not be missed out. I would suggest the thorough medical physical check-up by a Doctor. Thorough Clinical examination can either declare this as an incidence or can lead to further investigations. Sometimes it is better to observe such child for psychological changes - they are so prone to. A good clinician also takes care of this too. 