Don’t be overly nervous if your child has a sudden nosebleed. First, use a clean cotton ball or tissue to fill the nasal cavity, and then use cold water or ice packs to compress the head and face to shrink blood vessels and reduce bleeding. If the bleeding subsides, the nasal plug can be removed in 10 minutes, and you should avoid blowing your nose or picking your nose, and rinse the nasal cavity with physiological sea salt water to keep it moist and clean. If the nosebleed is particularly heavy and cannot be stopped by the above methods, go to the hospital in time to check whether there is any rupture of small arteries in the nasal cavity. If a ruptured blood vessel is found, electrocoagulation or tamponade sponge can be given to stop the bleeding. At the same time, complete the blood routine and coagulation function tests to rule out blood-related diseases.