Tendonitis: This problem triggers inflammation in the tendons inside the rotator cuff—the tissue bands that connect the muscles to the shoulder bones. Repetitive shoulder actions can irritate or pinch the tendons, resulting in tendonitis.  Men and women with TTH showed a reduce in muscle mass power inside the neck extensor muscles, https://www.theorthopaedicandpainpractice.com/chronic-neck-and-shoulder-pain-relief-strategies-to-reduce-discomfort-2/