It is possible to wash your hair when you have a fever. In the past, it was said that you could not wash your hair when you had a fever because the living conditions in the past were poor, and when you washed your hair, you were prone to getting cold, which would aggravate the fever. Now the living conditions are better and the temperature is higher, especially in the bathroom, so you can still wash your hair. The water temperature should not be too cold when washing your hair, it may promote vasoconstriction in the head, which is not conducive to heat dissipation. The temperature should not be too high either, which will aggravate the elevated body temperature. To use warm water, the temperature generally needs to be 3 degrees – 4 degrees lower than the body temperature. After washing your hair must be timely dry the water on your head, dry with a hair dryer to prevent the occurrence of cold, must not wash your hair outdoors, outdoor hair washing a blowing wind, it is easy to catch a cold.