Definition of fever Under normal circumstances, the body temperature can vary by 1 degree Celsius in the morning and 1.5 degrees Celsius in the evening. The body temperature can also rise by 1 to 1.5 degrees Celsius due to exercise, hot weather, or wearing too many clothes. If the axillary temperature exceeds 37.4 degrees Celsius, it is considered feverish. Causes 1. Dehydration caused by low body water intake, high perspiration, high room temperature, excessive clothing, etc. 2. Upper respiratory tract infection, gastroenteritis, urethritis, or even encephalitis or meningitis caused by virus or bacteria. Response If the axillary temperature is 37.4 to 38.4 degrees Celsius, you should: 1. Wear less clothes and should not be covered to facilitate heat dissipation. When you have a fever, your limbs will feel cold because the blood vessels under the skin of your limbs are constricted, so the traditional concept is to help your child put on a lot of clothes to “warm up the sweat” and the fever will go down. But this will only make the fever persist and even make the body temperature higher; 2. Encourage children to get more water; 3. Use a warm wet towel to rub the back and armpits, especially for about 15 minutes each time, to help dissipate heat and reduce body temperature. If the axillary temperature exceeds 38.5 degrees Celsius, consider giving your child fever-reducing medication, such as Benadryl syrup and Merlin syrup. Young infants should use antipyretics as little as possible to avoid affecting liver function, take antipyretics as prescribed by the doctor, but do not overdo it, because the role of antipyretics is only to make the body temperature drop temporarily, so that children are more comfortable, when the fever is actually dependent on the cause of the fever.