Re: If I'm excercising too hard, why does my abdomen, where the liver is, hurt?

I am not sure I understand what you mean by 'too hard', particularly in 
the context of the question. We have a saying here in general medicine 
when a person tells us: "hey doc, it hurts when I do this" - we 
say; "don't do that" or "stop doing that".

I need to know what you are doing for exercise. Exercises involving 
repetitive work may cause muscle fatigue, strain and then sprain. Sprain 
is partially torn muscle bodies and ligament disruption. Also work 
involving lifting too heavy a load may result in the above.

A warning - always give yourself breaks - ie M,W,F for weights and T,Th 
for stretching and light aerobic (try not to overuse muscles used during 
M,W,F. Sa or Su can be a rest day, and do something fun and active the 
other day. I took care of a young man (hospitalized for 2 weeks) several 
years ago who had lifted weights daily. He had 'torn/broke down' so much 
muscle tissue without giving it a chance to recover that he literally 
overwhelmed his kidneys with the 'myoglobin'. He became a bit concerned 
when his urine turned dark problem and his back was hurting in the mid-
back. His mother, possessing more common sense than him, rushed him to the 
Emergency Dept. The treatment then was massive on going IV hydration 
to 'flush out' the system and keep the kidneys running.