When there is blood in the nostrils, the following diseases are mainly considered clinically: 1. The most common is that some patients have bleeding from localized erosion and ulceration of the nasal mucosa when they blow their nose, and this bleeding is not arterial bleeding, and the bleeding is very small. The clinical examination should exclude the possibility of nasal swelling, then you can see the dryness of the nasal mucosa, mucosal erosion, etc. Clinically, you can let the doctor prescribe compound peppermint brain nasal drops to the nose. At the same time, you can also use recombinant bovine basic fibroblast growth factor gel to coat the nasal cavity, which is very helpful to promote the healing of the erosion; 2. Some patients have blood in the snot, especially blood in the retracted snot, which may be the early manifestation of nasopharyngeal cancer. Clinically, it is recommended to do electronic nasopharyngoscopy to examine the nasopharynx to rule out the possibility of cancer; 3. Some patients, such as those with early manifestations of nasal maxillary sinus cancer or septal sinus cancer, may also have blood in their snot. However, in addition to blood, such patients may have clinical manifestations such as nasal disinflation and long-term yellow pus nasal discharge. All in all, for patients with blood in the nose, it is recommended that they should try to go to ENT department for nasal endoscopy for routine examination of nasal cavity and, if necessary, for CT examination.