Nosebleeds during fever are most often seen in children with chronic rhinitis. These children usually have damaged nasal mucosa inflammation and when they have a fever, the water in their body becomes less, the nasal mucosa becomes dry and the damage is exacerbated, and the capillaries in the nasal mucosa dilate when they have a fever, so they bleed easily. If a child has a fever and does not drink water, he or she will be more likely to have a nosebleed if they take antipyretic drugs and sweat more and become dehydrated. If nosebleeds are frequent, you also need to be alert to blood system disorders and seek medical attention as soon as possible if necessary.