Rhinorrhea is one of the common clinical symptoms, which can be caused by nasal diseases or systemic diseases. Most of the nasal bleeding is unilateral, and in a few cases, bilateral nasal bleeding can occur; the amount of bleeding varies; in mild cases, it is only blood in the snot, and repeated nasal bleeding can lead to anemia. The number of children with nasal bleeding in daily life and clinical work is quite large. The rich distribution of blood vessels in the nasal cavity can lead to rhinorrhea under the action of various pathogenic factors. The branches of the pterygopalatine artery, the anterior septal artery, the posterior septal artery, the branches of the superior labial artery and the palatine aorta anastomose under the anterior nasal septum to form the reticular arterial plexus, called Little’s area, which is the most common site of rhinorrhea, and it is also the most common site of rhinorrhea in children and adolescents. In view of the above common causes, it is basically possible to understand the cause of rhinorrhea as long as the child visits a specialist and routinely examines the nasal cavity and nasopharynx via anterior rhinoscopy and nasopharyngoscopy. Of course, we cannot ignore the common systemic diseases in children, namely the dreaded leukemia or hematological diseases, which are the common systemic causes of nosebleeds in children. Therefore, a routine blood test is essential to rule out blood disorders. When nosebleeds occur in children, use your fingers to pinch the nasal flanks bilaterally or press the bleeding side of the nose toward the nasal septum for about 10 to 15 minutes, or use your fingers to press the upper lip area transversely, while applying cold compresses to the forehead and the back of the neck. This method is suitable for patients with a small amount of bleeding and bleeding in the anterior part of the nasal cavity, and patients who have nasal bleeding at home can take this method. If you come to the hospital, if the bleeding is lighter in the anterior part of the nasal cavity, for the bleeding area, you can apply a cotton pad dipped in 1% ephedrine, 1‰ epinephrine, 3% hydrogen peroxide solution or thrombin and tightly plug the nasal cavity for several minutes to several hours to stop the bleeding. In addition, bleeding located in the anterior and inferior part of the nasal septum, after adequate contraction and anesthesia of the nasal mucosa, the bleeding site is clearly visible, and the bleeding point can be cauterized with a roll of cotton dipped in a little 30-50% silver nitrate or 30% trichloroacetic acid, and pressed at the bleeding point for a few moments until a local white film is formed. In a few children, when the anterior nasal active bleeding is intense, the anterior nostril should be filled with Vaseline oil gauze, but of course, it is only a small section, and the purpose is also to stop the bleeding by compression. Usually, attention should be paid to the prevention of rhinorrhea, measures include: 1. keep the room quiet, clean, the temperature should be appropriate. Keep the air in the room fresh, open the windows properly for ventilation, and the temperature should be kept at 18 to 20℃. The air humidity should be ≥60% because the air is too dry to induce nasal bleeding.2. Do not blow the nose forcefully and stop coughing.3. Eat soft food that is easy to digest, eat more fruits and vegetables, avoid spicy and stimulating diet, and keep the bowels open. 4. Correct the bad habits of the child that may lead to mucosal damage such as nose picking, nose rubbing and curious placement of foreign objects.