When you exercise, you are using several muscle groups throughout the body — even if you are not targeting them specifically. Muscles can easily become pulled or strained during a workout. Most common muscle pains, especially in the abdomen, go away after rest and might or might not return the next time you exercise or apply any physical exertion. You can generally recognize the differences between liver pain and a torn muscle.
Liver pain ranges from a dull ache just below your breast bone that can extend into your mid to lower back, to a sharp pain under the breastbone that extends to your right side. The pain might increase as you increase cardio output. You might also experience extreme fatigue with the pain, and in serious cases, a yellowing of the skin and eyes can occur – this is called jaundice.