Originally posted by: Tea Bag
I had the EXACT thing happen about 2-3 months ago. They are incredibly painful and are called Exertion Headaches.
http://www.headaches.org/consumer/topicsheets/exertional.html
That's a breif description of what they are, but there is alot more out there. If they are at a 'migraine' pain level (if you have ever had one) - I suggest going to the doctor or seeing a neurologist. After consulting my neurologist, he figured that they would not have any adverse effect, but he still gave me an MRI to rule out an anurism, then put me on anti-inflammatories. I took them the first month 30 minutes before I exercised. After that, I've been fine.