• why do muscles swell? Lots of reasons.
You could have injured one, strain, sprain
, torn or bruised it. Or, you could have had a workout
and you are noticing the increased blood flow that causes them to be a little swollen....
• what is to swell up?
To expand, to get larger. Swelling often involves the absorption of water or other liquids.
Read more: http://wiki.Answers.Com/q/does_the_musc.