The basic cause of pediatric rhinorrhea is that the nasal mucosa erosion or ulcers damage the arterial capillaries on the mucosa, causing rhinorrhea. There are several common causes as follows: 1. Dry air; 2. Children aged 2 to 5 years old like to dig their noses with their hands or will stuff various foreign objects into the nasal cavity, which also often causes nasal bleeding. 3.Nasal trauma, inflammation, tumor, deformity, foreign body, etc. of the nose can also cause nasal bleeding, which is a specific case of nasal bleeding. 4.Nasal bleeding caused by blood system diseases is not very common, but due to the serious consequences, it must be paid attention to, such as thrombocytopenic purpura, leukemia, etc. 5.Some systemic diseases such as liver and kidney diseases are also causes of nosebleeds. However, nosebleeds caused by these causes are often accompanied by systemic symptoms. How to do about nosebleeds in children? What parents do first: 1. First of all, do not panic, let the child hang his head slightly, and try to spit out the blood that has flowed into the mouth, so as not to swallow it and stimulate the stomach to cause vomiting. 2, the child or family members with fingers tightly squeeze the bilateral nose Ji 10-15 minutes, during which you can not let go. 3.If the above methods cannot stop the bleeding, you should go to the hospital for treatment. 4.After the bleeding is relieved, further examination can be conducted at the hospital to exclude the possibility of systemic diseases and other diseases of the nose. Note: If recurrent bleeding for a long time or excessive bleeding cannot be stopped effectively you should go to the hospital in time. What the doctor does: 1. The doctor will ask the child in detail which nostril is bleeding, how much it is, how often it bleeds, and whether there are bleeding spots on the skin of the body. 2.The doctor will examine the nasal cavity in detail and look for bleeding points (mostly in the front of the nasal cavity). Nasal endoscopy is feasible to clarify whether the nasal cavity is combined with inflammation or new organisms. If there is any abnormality, the doctor will suggest the parents to take the child to the hematology department for further examination.