Many things: Dehydration, over-exertion, stress and anxiety, and last but not least, how many times have you been hit in the head? Seriously though, the other thing to be concerned about is your heart rate and rhythm. If your pulse is in any way irregular you need to see a doctor and have this checked.
Answered 7/28/2012
5.7k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question