Nosebleed — what it is, common causes and how to respond

A nosebleed (epistaxis) is a frequent problem resulting from bleeding of small blood vessels inside the nose. This page summarizes typical triggers, practical first-aid measures, signs that need urgent attention, and when to see an Ear–Nose–Throat (ENT) specialist.

What a nosebleed is and how it starts

Nosebleeds occur when the delicate vessels in the nasal lining break and bleed. Local causes such as minor trauma to the nose, dry indoor air, nose picking, upper respiratory infections or allergies are common. Systemic factors — for example high blood pressure, medications that affect clotting, or bleeding disorders — can increase risk. Age matters: children and older adults may have different typical causes, and repeated bleeding should prompt further evaluation.

First aid: simple steps you can try

Stay calm and sit upright. Lean slightly forward to avoid swallowing blood and breathe through your mouth. Pinch the soft part of the nose firmly between your thumb and index finger and hold continuous pressure for at least 10 minutes; repeat if needed. Do not tilt the head back. If bleeding is heavy, you have trouble breathing, feel faint, or bleeding follows a head injury, seek immediate medical help.

Common causes and warning signs

Frequent local causes include nasal trauma, dry mucosa, chronic irritation, septal deformities and inflammation. Systemic contributors include high blood pressure, anticoagulant medications, and blood-clotting disorders. Warning signs that require prompt care are persistent or very heavy bleeding, breathing difficulty, repeated fainting or a nosebleed that starts after significant head trauma.

Prevention and specialist referral

To reduce risk, keep indoor air moderately humid, avoid picking the nose, and use saline nasal sprays to maintain mucosal moisture. For recurrent or unexplained nosebleeds, an ENT specialist can assess anatomical causes, recommend appropriate investigations, and advise on preventive measures. Emergency assessment is indicated for severe bleeding, suspected major trauma or signs of significant blood loss.

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