How long should a nose bleed persist before you call 911?

A nosebleed that lasts for an extended duration can indicate a more serious underlying issue that may require medical attention. When a nosebleed persists for 30 minutes or more, it is generally advised to seek emergency assistance. This timeline is based on the understanding that most nosebleeds can be resolved at home with common first-aid measures, such as pinching the nose and sitting upright. However, if bleeding does not stop after this considerable amount of time, it could signify a more significant problem, such as a disruption in blood clotting or damage to the blood vessels in the nasal area. In this case, calling 911 ensures that the individual receives timely medical evaluation and treatment to prevent potential complications.