Epistaxis is the medical term for a nosebleed, which occurs when blood vessels in the nasal cavity rupture. This can happen due to various reasons, including dry air, allergies, or trauma to the nose. Most nosebleeds are not serious and can often be managed at home. There are two main types of epistaxis: anterior and posterior. Anterior epistaxis originates from the front part of the nose and is more common, while posterior epistaxis comes from the back and can be more severe. Treatment typically involves pinching the nose and leaning forward to prevent swallowing blood.