The common reasons for patients to have blood in their nose recently are as follows: 1. Dry nasal cavity: having blood in the nose is often related to the overly dry state of the nasal mucosa, and the dryness of the nasal mucosa can cause the nasal mucosa to be prone to erosion, rupture and repeated, small amounts of blood. 2. Infection and allergic diseases: some patients may have a certain degree of nasal cavity, sinus inflammation, infection and allergic 3, nasal septal deviation and foreign body hyperplasia: Patients may have the effect of nasal septal deviation factors, or various benign and malignant tumors and hyperplasia in the nasal cavity, sinus and nasopharynx area, including hemangioma, papilloma, etc., which may also lead to old blood. If necessary, nasal endoscopy as well as imaging of the nose are needed to comprehensively analyze the cause of the patient.