What should you do if a nose bleed doesn't stop after 10 minutes of pinching the nose?

Continuing to apply pressure by pinching the nose for an additional 15 minutes is appropriate in the case of a nosebleed that does not stop after the initial 10 minutes. This method allows for consistent pressure on the bleeding vessels, which can help to promote clotting and ultimately stop the bleeding.

Applying ice to the nose can provide some benefits by constricting blood vessels, but it may not be as effective as continued pressure. While pinching for 5 more minutes might seem reasonable, it's often better to apply pressure for a longer duration to ensure that the bleeding has truly stopped. Lying down for 30 minutes may not directly address the bleeding and can potentially lead to swallowing blood, which is not advisable.

Thus, pinching the nose for 15 more minutes is a more proactive approach to controlling the situation.