please read-- heartburn problems

hi. my daughter recieved a trampoline a couple of years ago and has complained of getting heartburn while on it. she says it is fine while she is in the air but once her feet hit the mat she gets a sharp pain that feels like heartburn. i am not sure if it is heartburn or what ... so could someone please help me?
That's an interesting occurance!  It only happens when she's on the trampoline?  Maybe the force from jumping and such is causing her the pain.  I've really never heard of anything like this, so I'm afraid I'm not much help.  I'd maybe take her in to the Dr. if you are concerned, just to rule out any underlying conditions.
 
Hope all goes well! :)
Toni