If there is a sudden pain in the shoulder when lifting the shoulder, it is mainly due to three reasons: First, strain or cold-related stenosing tenosynovitis of the shoulder joint, such as biceps longus tendonitis, which may cause a sudden pain in the front side of the shoulder joint when lifting the shoulder, and there is also obvious pressure pain in the front side of the shoulder joint. This is usually seen in middle-aged and elderly people. When the shoulder is lifted, the enlarged bone will stimulate the surrounding ligaments and joint capsule, resulting in a sudden pain in the shoulder joint. This is mainly due to adhesions and contractures of the ligaments and joint capsule around the shoulder joint, which may cause sudden pain in the shoulder joint when lifting the shoulder.