If you have a fever and are cold, you can cover yourself moderately, especially when you fall asleep, but if you do not fall asleep, try to cover yourself as little as possible with a thin blanket or without a blanket. The fever appears cold often because the body’s heat production increases, heat dissipation decreases, in order to reduce heat dissipation, the capillaries on the surface of the skin will appear contracted, the blood circulation on the surface of the skin is poor, appear to feel cold. The body temperature tends to rise gradually, so if you cover yourself with a thicker blanket, the body’s heat dissipation will be reduced even more, which in turn will cause the body temperature to rise even more and aggravate the symptoms of fever. So if you fall asleep during the fever and chills, you can cover a small amount of thin quilt, if not fall asleep try not to cover the quilt better. It is also necessary to measure the body temperature to ensure that the temperature is below 38.5 degrees, as long as the body temperature exceeds 38.5 degrees, you need to use antipyretic treatment, such as acetaminophen.