Although weather changes are not the cause of arthritis, arthritis patients are more likely to have good summers and bad winters. Some patients’ joints may even be up to the task of weather forecasting. For example, if it will get cold tomorrow, his joints will give out painful symptoms tonight. Theoretically, it should be due to the change in air pressure. The human joint is where the bone meets the bone. It is a cavity. This cavity itself has a pressure value, and the opposite of this pressure value is the external atmospheric pressure. The two pressure values inside and outside are not the same, there is a difference. Whenever the weather becomes colder, the outside atmospheric pressure decreases, while the pressure value inside the joint cavity does not change significantly. As a result, the original pressure difference becomes larger, further aggravating joint symptoms. Since different individuals have different sensitivities to this change in pressure differential, not all patients will react the same way. Therefore, it should be clear that cold weather aggravates joint symptoms, but does not worsen the inflammation itself, so there is no need to worry too much.