<s>[INST] 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? [/INST] 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. </s>