Tendonitis in the shoulder results when inflammation pinches or traps the tendon against bones. Shoulder tendonitis pain—usually felt at the tip of the shoulder or radiating down the arm—commonly occurs when the arm is lifted overhead or twisted. Symptoms can range from mild stiffness to severe pain. Tendonitis can cause muscle weakness and imbalances, which can lead to further injury and pain. Dry needling can help to restore proper muscle function by releasing tension and improving blood flow