Epistaxis, commonly known as a nosebleed, occurs when blood vessels in the nasal cavity rupture, leading to bleeding from one or both nostrils. This condition can be caused by various factors, including dry air, allergies, nasal injuries, or underlying health issues. Most nosebleeds are not serious and can be managed at home. To treat epistaxis, it is recommended to sit upright and lean slightly forward to prevent blood from flowing down the throat. Pinching the nostrils together for about 10 minutes can help stop the bleeding. If nosebleeds are frequent or severe, consulting a healthcare professional is advisable.