Hi everyone: has anyone experienced sharp nasty pains and dull aches under the left arm pit, and where the under arm meets with the chest. Pain radiates in the left arm. Either on the back side of the arm, or a different type of pain in the hand bones and fingers of the left arm.... Does it have to do with the heart, it is definitely not a muscle pain or nerve pain, but then who knows???? I have this since April this year??? Thanks for your replies. furstc.