I had that prob last year. My liver was so big I stop sleeping on my stomach. They did blood test, urine test ect and didn't find anything weird. They did an ultrasound and they couldn't find the prob but what worry me the most was that the tech asked me if I had a surgery on my liver because she saw an scar and I said no. So I have no idea of wth she saw! My biggest prob was that I was preg when all this was happening so the docs when your preg they don't wanna pay attention to you because they assume that all your probs are coming from the baby -.-.. I had an MRI done and they found out that I had lil bit of fat in my liver but it was not that much to cause that much probs. The funny thing is when I was 5 month preg all my probs went away and my liver went back to normal... My liver was almost 15 cm more than normal. Normal liver has a size of 7CM mine was away bigger... Do not sleep on it because they can't find a prob doesn't mean you dont have a prob!! I dont drink, smoke or take drugs. I am healthy!