Most of the time there wont be pain associated with liver problems. The inside of the liver itself doesnt "hurt" it cant produce pain, the capsule that holds the liver itself can cause pain however if the liver is swollen or something pokes it etc. Blood tests are the way to monitor your liver and other body parts, the next symptoms you would get are yellowing of eyes, hands, under tongue etc. this is caused by excess of bilirubin in the blood and the liver isnt working at its normal function. At that point you need to get to the doctor asap as their is something wrong.