Pectoralis minor syndrome

The most common cause of tingling and/or numbness in your entire hand is compression of the nerve bundles between your chest muscle (pectoralis minor) and your chest, known as pectoralis minor syndrome. 

Your hand is supplied by five nerve roots that branch off your spinal cord in your neck at five separate levels. They all come together and pass through a canal formed by two muscles in the front of your neck (scalene) and your first rib, called the thoracic outlet. The bundle of nerves then pass through another canal formed between your chest muscle (pectoralis minor) and the front of your ribs before branching off to supply the various parts of your arm, forearm and hand. 

Other symptoms can include:

• Chest pain

• Shoulder pain

• Inner arm, inner elbow and small and ring finger pain

• Swelling or puffiness in your arm or hand

• Bluish discoloration of your hand

• Feeling of heaviness in your arm or hand

• Easily fatigued arms and hands

• Superficial vein distention in your hand

• Chest Pain

• Muscle weakness and wasting of your hand gripping muscles

• Difficulty with hand fine coordination