Nosebleed in middle-aged and old people may be a symptom of nasopharyngeal cancer, liver cirrhosis, hemophilia and other diseases, and you can not judge which disease is a sign by nosebleed. 1. Nasopharyngeal cancer: the occurrence of this disease is mainly related to heredity, EBV infection, eating too much pickled food, air pollution and other reasons. Nasopharyngeal cancer is most common in people aged 40~50. Generally, it may be asymptomatic in the early stage, and with further development of the disease, patients will have symptoms such as nosebleed, nasal congestion, tinnitus, decreased sense of smell, and so on. 2. Cirrhosis: The causes of this disease include viral hepatitis, alcoholic liver disease, long-term cholestasis, heredity, immune disorder, parasitic infection and so on. It can be induced by long-term alcoholism, overwork, obesity and other factors in middle-aged and old people. When cirrhosis develops to the decompensated stage, patients will have symptoms such as nasal bleeding and loss of appetite. 3. Hemophilia: this disease is mainly related to abnormal coagulation function, there is a certain heredity, a few patients are caused by gene defects or mutations. As this disease will lead to bleeding tendency, it may be triggered when the immunity of the body decreases, therefore, the patients will have symptoms such as nosebleed, joint bleeding, etc. When the middle-aged and old people have nosebleed, they may have symptoms such as loss of appetite. When middle-aged or elderly people have nosebleeds, they should actively go to the hospital for consultation to clarify the specific cause.