Why do my hands feel stiff and hard to move after waking up on cold days?
1. Introduction Morning hand stiffness on cold days occurs because lower temperatures thicken the synovial fluid that lubricates the joints. During sleep, reduced movement allows this fluid to pool and become more viscous. The combination of local vasoconstriction from the cold and temporary fluid stasis restricts the smooth gliding of tendons and joint surfaces. When … Read more