The vast majority of small children with nosebleeds, as long as it is not caused by obvious anemia, there is no need to worry too much, most of them are not a problem. The key to nosebleeds depends on what causes them, the first and most common is due to the dryness of the nasal mucosa, especially in some babies, the nasal capillaries are rich, brittle and can bleed spontaneously when the air is dry, or when blowing the nose with force. In addition, respiratory tract infection, allergic rhinitis, nasal mucosa erosion, congestion, edema, can also appear. There are also diseases of the ear, nose and throat, such as deviated septum and nasal polyps, which can also present with nosebleeds. What is often feared to be prone to cause serious damage is also other hematologic diseases, thrombocytopenia, abnormal coagulation function, and nosebleeds caused by these diseases are something that needs to be paid close attention to because they may be accompanied by abnormalities in other aspects of the body.