Serratus Anterior Muscle: Rib, Arm, Finger, Upper Back Pain
The serratus anterior muscle contributes to pain down the side of the ribs, around the shoulder blade, chest, arm, hand, and fingers.
pancreatitis
Diaphragm Muscle: Chest Pain, Rib Pain, Difficulty Breathing
The diaphragm is a muscle found under the lower ribs. It can contribute to breathing problems, pain in the chest, ribs, and can cause sharp pain in the side known as side stitches.