My DD is now 16.5 yrs old. Last year She had training sessions with a personal trainer in a private gym during which she fainted 2 or three times over several months. She used to play competitive sport at a high level but stepped down a bit to focus more on schoolwork so the PT was to replace the exercise she was used to. Fainting or feeling faint never happened during previous sports training. She scaled back for exams before summer and has recently joined a regular gym to start exercising again and has fainted on a treadmill, injuring herself quite badly this time. She is mortified and just wants to pretend it never happened but has no memory of falling. She says she was jogging along and next thing was in shreds on the floor.
We have a terrible family doctor, otherwise I would not hesitate to bring her in for a check up. Just looking for a general consensus as to whether teenaged random fainting is a thing I should be worried about or am I being hysterical (as my GP implies)?