If five-year-old children often have nosebleeds, there are two main causes: 1, often picky eating causes nutritional imbalance, causing the nasal mucosa vascular brittleness is relatively high, the nasal mucosa is easy to crust appear bleeding. If you want to solve this problem, you should eat more vegetables and fruits and less greasy food, and you can also add vitamins. 2. The mucous membrane in the nasal cavity is dry and has more crusts, and often digging the nostrils causes the mucous membrane in the nasal cavity to rupture and bleed. If you want to solve this problem, you can use drugs that lubricate the mucous membrane of the nasal cavity, such as compound menthol nasal drops to drip the nose, you can also use Beefeater ointment to apply the mucous membrane in the nasal cavity, so that the broken mucous membrane can recover as soon as possible. There are also rare causes of nasal swelling or hematological disorders that require further examination of the nasal cavity or laboratory tests of the hematological system.