Lots of things.: Your question is very vague; many more details are needed to provide a good answer. It could be fatigue, over use, virus, fibromyalgia, or many things. If it persists, you should see your doctor to get it evaluated.
Answered 5/14/2013
5.1k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question