Originally Posted by Puppypaws
There are a zillion causes for headache:
High bloodpressure
arthritis in the neck
familial tendency to migraine
sinuses
hypoglycemia or hyperglycemia
spinal fluid leak
arnold chiari malformation
subdural hematoma
other mass lesions.
....easy things first, check your blood pressure.
(neurologist)
This is true, but we are talking about a headache that is triggered after excersise. I would guess that it is most likely allergy related. I get them all the time. You should be asking your doctor though if they are to the point where you can't take it anymore.