Pain in both shoulders at the same time may be due to the following reasons: 1. It may be caused by overexertion. This condition is often seen when the patient does excessive exercise involving the upper limbs, or does excessive labor, such as heavy lifting, then during rest, there may be a large amount of lactic acid deposited within the muscles of both shoulders, which in turn leads to soreness in the bilateral shoulder joints. 2. It may be caused by rheumatic diseases, such as rheumatoid arthritis, which may involve bilateral, symmetrical joints at the same time, that is, it may cause bilateral shoulder joint pain, stiffness and unfavorable activities. 3. It may be caused by cold, such as when the patient If the shoulder joints are not covered during sleep and are blown by the cool wind, it may induce internal sterile inflammation and cause bilateral shoulder pain. 4. It may be caused by poor posture, for example, if the patient sits or stands for a long time, or has a poor sitting posture during sitting or standing, it may cause muscle spasm in the bilateral shoulder, which may lead to bilateral shoulder pain.