Sudden nosebleed such as unknown cause and location, you can try to stop bleeding through physical compression, ice packs and other methods of emergency bleeding, bleeding can be stopped through the initial treatment need to actively seek further medical treatment, and bleeding is serious and uncontrollable need to consult a doctor in a timely manner. 1. Nasal bleeding is small: you can use sterilized cotton balls to plug the bleeding nasal cavity, and at the same time, use your hand to press the bleeding side of the nose until it does not bleed. 2. Large amount of nosebleed: large amount of bleeding may cause dizziness, you should promptly take a seated position, head slightly tilted forward, the use of ice packs, ice wrapped in a towel to shrink the nasal blood vessels to achieve the purpose of assisting in stopping bleeding. 3. Nosebleed serious: nosebleed serious physical methods can not quickly stop bleeding, the need for timely medical care or call 120 emergency, while repeating the bleeding action, and pay attention to the bleeding person’s state of consciousness, blood pressure, pulse and so on. Don’t panic after a sudden nosebleed, quickly stop the bleeding by physical methods, and choose whether you need to consult a doctor in time according to the degree of bleeding and whether you suffer from high blood pressure, diabetes and other primary diseases.