Why do your muscles hurt?

Question

What make your muscles hurt?

Like i know what you have to do to make them hurt, but why do they hurt?

What is going on in your muscles that gives the effect of pain?

I didn't really know how to word that question so hopefully you understand what I am trying to ask.

thnks =]

Answer 1

Working your muscles is predominantly an anaerobic activity (a type of respiration not involving oxygen but involving lactic acid), and that pain is partly caused by the lactic acid build up after strenuous muscular activity. The amount of oxygen required to break down the lactic acid is called the oxygen debt.

Answer 2

When you lift alot of weights

Answer 3

Fighting people. But my muscle hurt is nothing, you should see the other guy.