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Ever hear someone with arthritis say they can predict the weather? When it comes to the cold, they may be right. Many of the 46 million Americans who suffer from arthritis or other joint-related conditions say frigid temperatures make their symptoms significantly worse. While the science has been mixed on why this happens, one study found that joint pain increases with every ten-degree drop in temperature. Researchers think one reason could be that the cold air causes the fluid surrounding the joints to thicken, which can reduce mobility. While the resulting stiffness isn't necessarily dangerous, it can be painful and uncomfortable. To ease your symptoms, keep moving: Regular exercise is the best way to loosen stiff joints.