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Why in winter there is increase in urination ?
Answer

During winter, the surrounding temperature will be very low. There is no sweating, there are no evaporation losses. To keep the body temperature constant, the blood capillaries in the skin are constricted and the blood pressure is increased. In order to maintain the blood pressure normal, the excess water along with the wastes is excreted mostly in the form of urine resulting in frequent urination in winter.