Bit of background I have a 16 year old DD. She is very very active usually and is going to college in September to concentrate on her sport. She has always been very active, competitions from the age of 4. In the last 7 weeks she has been having dizzy spells. She hasn't been able to get through a 45 minute zoom class without having to sit down several times whilst the dizziness passes. I mention zoom because these classes are much less intense than the face to face ones she could do easily prior to this. She is more tired than usual but not lying around not functioning tired if you see what I mean. She can get dizzy standing up or walking around but it is mostly when she is exercising. We have been to the doctors and she has had blood tests that we are waiting on the results of and has had an ecg which, thankfully, was all fine. Does anyone have any idea what it could be? She drinks well and eats well (she is fussy but eats a lot)