The common causes are rhinovestibulitis and allergic rhinitis. The nasal mucosa of young children is relatively tender, and there are more capillaries on the nasal mucosa. Sometimes with sneezing or violent coughing or nose picking, it is easy to cause nosebleeds. Generally, after the treatment of hemostasis, it will stop soon and will not recur. However, in rare cases, routine blood tests and coagulation tests are needed to rule out any hematologic disorders or coagulation disorders. Other than that, most nosebleeds in children as young as five years old do not require stress.