There are many reasons for nosebleeds, related to local factors in the nasal cavity and systemic diseases.
1. Local factors:
(1) trauma: nasal trauma, craniofacial solid fracture, nasal surgery, often digging the nostrils traumatic factors, may also lead to the phenomenon of nosebleed.
(2) Nasal septum deviation: the mucous membrane at the convex surface of nasal septum deviation is easy to dry and blood vessels are easy to rupture, resulting in nosebleeds.
(3) Tumor: Nasal hemangioma, fibroma in the nasal cavity, etc. can also cause nosebleeds.
(4) Infection: acute and chronic rhinitis, sinusitis, atrophic rhinitis, nasal tuberculosis, nasal syphilis and so on can also cause nosebleeds.
(2) Systemic factors: hypertension, pulmonary heart disease, blood diseases (leukemia, hemophilia, thrombocytopenic purpura, aplastic anemia, etc.) and other causes.
There may be other reasons for nosebleeds, and you need to go to the hospital for examination in time.