Sore shoulders when riding a motorcycle may be caused by muscle spasm, frozen shoulder, cervical spondylosis and other factors. 1. Muscle spasm: When riding a motorcycle, if you don’t pay attention to keep your shoulder warm and are stimulated by cold wind, it may cause muscle spasm in the shoulder, which will lead to shoulder pain. 2. Frozen shoulder: It may be related to the degeneration of the soft tissue of the shoulder joint, long time over-activity, etc. Riding a motorcycle for a long time or being frequently stimulated by cold wind may aggravate frozen shoulder, which will cause shoulder pain and soreness, and in serious cases, it may also cause shoulder activity limitation. 3. Cervical spondylosis: It may be related to cervical degeneration, prolonged bowing of the head, etc. Improper posture leads to aggravation of cervical spondylosis, so that the nerves innervating the upper limbs are compressed, accompanied by upper limb radiating pain, numbness and other symptoms. Riding a motorcycle shoulder pain, it is recommended to seek medical examination and treatment.