Nosebleeds are not a precursor to sudden death. There are many reasons for nosebleeds, such as damage to the nasal mucosa and high blood pressure. Sudden death is usually caused by cardiovascular and cerebrovascular diseases or mental over-excitement, which usually do not cause nosebleeds. Cardiovascular and cerebrovascular diseases cause sudden death mainly because the heart blood supply is not, the heart stops beating, cerebral hemorrhage, etc. caused by, or the spirit due to a long period of exertion, suddenly suffered a more powerful mental stimulation, may make the brain nerve necrosis, resulting in sudden death. Lower humidity in the air may lead to dryness in the nasal cavity, which makes people feel itchy in the nose and relieve it by picking the nose, which may break the nasal mucosa and cause bleeding. You can drink more water to increase your own water, increase the water content in the nasal cavity for relief. Patients with high blood pressure may experience a sudden rise in blood pressure due to exercise, stimulation, etc. Since the blood vessels in the nasal cavity are relatively fragile, they may be rushed through by the fast-flowing blood, resulting in nosebleeds. It is recommended to exercise moderately and maintain a good mental state to avoid a sudden rise in blood pressure.