A pulled (or strained) muscle could take a few days to feel better. Severe injury could take weeks to months. Find out what ...

and arm movements. Injuries to these muscles can cause upper back pain. The feeling can be a dull ache or a sharp pain. Exercise may increase the risk of muscle strain or tear. This is ...

It's not lactic acid (that's a myth), but rather a phenomenon known as DOMS, for "delayed onset muscle soreness." It's most likely to happen when you do something different than what you're used to.

SORE MUSCLES ARE often worn with a badge of honour. Struggle moving for a few days, though, and that accolade gets old, fast. 'The significant muscle soreness that typically occurs 24 to 48 hours ...