Because of its strength and position, pectoralis major spasms pull the arms and shoulders forward. When the pec major contracts it pulls the arms forward, in a sitting posture this rounds the shoulders. People with rounded shoulders are more likely to experience chronic or acute shoulder sprains, including supraspinatus tendinosis or rotator cuff sprains.
Pectoralis major muscle spasms can lead to trigger points developing in the muscle. Trigger points are areas of muscle that have been injured to the degree that it radiates pain to other areas. Mild muscle injuries hurt at the location of the injury only. . Aggravated trigger points radiate pain several inches or feet away, including down the hand. Trigger points in the pectoralis major muscle radiates from the chest, to the shoulder, and even down to the elbow. At its worst, pain can be felt in the 3rd and 4th fingers of the hand.
The pain originally begins as stiffness and mild soreness in the chest. An increased dull ache or burning may develop as the muscle becomes more injured, and eventually leading to a deep throbbing ache across the shoulder or down the arm. The pain is relieved by resting, icing, or stretching.
As mentioned earlier, pectoralis major muscle spasms create pain and injuries in the neck, shoulders, and back by changing the shoulder position. The pectoralis muscle should be evaluated and addressed in someone complaining of neck, shoulder, or back pain.
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