Xyphoid process: There is a nub of a bone just below the sternum ( breastbone) called the xyphoid process that most people don't know they have. It sticks out a bit and you may only notice it when you are laying on your stomach. The knot under your left rib cage may be the end of your 11th rib. Another possiblity is something called a lipoma which is really just a hardend peice of fat. No worries.
Answered 3/24/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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