Nosebleeds may be caused by incorrect cleaning methods, or dry rhinitis, atrophic rhinitis and other diseases. 1. Incorrect cleaning: if the patient in the use of saline nose cleaning, when the water temperature is too low or too high, too much pressure may lead to local vascular contracture or dilation of the nasal cavity after the rupture, nosebleed. 2. Dry rhinitis: dry rhinitis may be indigestion, anemia, constipation, dry climate and other factors, when the patient himself suffers from dry rhinitis, when the use of saline to clean the nose, can cause mucous membrane stimulation by the rinse, nosebleeds occur. 3. Atrophic rhinitis: Atrophic rhinitis may be caused by heredity, long-term stimulation by harmful gases, immune dysfunction, infection and other factors. Patients may have symptoms such as nasal dryness, nasal congestion, olfactory impairment, etc. When patients use saline to wash their noses, the pus crusts come off, and there may be mucous membrane rupture and nosebleeds. There are many reasons that lead to nosebleeds when washing the nose with saline, and patients need to clarify the cause of the disease in time.