Why does sinusitis cause nosebleed?

The front part of the nasal lining contains small blood vessels close to the surface. Infection or irritation can leave that lining swollen, dry and fragile. Blowing hard, picking crusts, coughing or using a tissue repeatedly can then disturb a vessel. Nosebleed is a common presentation of Sinusitis, while nosebleeds can also result from dry air, minor irritation, injury, medicines or other conditions. The amount of blood can look alarming even when a small vessel is involved.

Sit upright, lean slightly forward, and gently pinch the soft part of your nose below the bony bridge. Breathe through your mouth and avoid lying flat or tilting your head back, which can make blood run into the throat. Once it stops, avoid forceful blowing and strenuous activity for a while. Saline spray and a humid environment may reduce drying; a pharmacist can help you choose a suitable product.

Get urgent help if bleeding is heavy, does not settle with continuous pressure, follows a significant injury, or comes with weakness, faintness or breathing difficulty. Arrange a medical review for repeated nosebleeds, bleeding while taking blood-thinning medicine, or sinus symptoms that are persistent or worsening. Seek prompt assessment if there is swelling around the eyes, severe headache or a change in vision.

Ask whether inflammation, dryness, a nasal medicine or another trigger is likely to be irritating your nose. Tell the clinician about regular medicines, including anticoagulants, and whether one nostril is affected more than the other. Ask which moisturising or saline option is appropriate and how to manage future bleeds.