Frequent nosebleeds in patients with allergic rhinitis are generally caused by edema, brittle texture and vasodilatation of the nasal mucosa, which are caused by inflammatory injury and external impact and extrusion. Patients with allergic rhinitis have the symptom of always having nosebleeds, which is generally caused by allergy of the nasal mucosa leading to the nasal mucosa being in a swollen and edematous state for a longer period of time, and repeated large amounts of nasal mucus in the nasal cavity, which induces localized vesiculation and ulceration of the nasal mucosa, which may easily lead to the exposure of capillaries under the mucous membrane, and thus nasal bleeding occurs. In addition, as the allergy of the nasal mucosa may cause repeated nasal itching as well as sneezing, it may cause the patient to experience repeated nose blowing or frequent sneezing, which may also easily lead to ulceration and bleeding of the nasal mucosa. It is recommended that patients go to the hospital to improve the relevant examination, and give targeted treatment after the doctor clarifies the cause of the disease.