Headache from bouncing on trampoline?

[Verycold]

Dd who is 13 has recently found she gets a headache from going on the trampoline. Any ideas what it could be?

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Could it be that the impact is jarring her neck maybe?

Is she headache prone at any other time, migraines etc?

Not much. I was thinking neck as well...

Neck muscles tensing up was my first thought.