Cough nose bleeding may be upper respiratory tract infection, rhinitis and other diseases, may also be dry air and other factors. 1. Upper respiratory tract infection: the virus spreads through the respiratory tract by way of invasion of the mucosa of the upper respiratory tract, resulting in acute inflammatory lesions in the nasal cavity, throat and other parts of the capillary permeability increases, resulting in mucosal exudate, hemorrhage and other changes. The body through the immune system to destroy the invading virus, the formation of secretions stimulate the respiratory tract cilia discharged through coughing, so will cough nose bleeding. 2. Rhinitis: contact with hair, dander, dust, pollen, willow, seafood and other allergens or bacterial infections and other factors leading to an inflammatory reaction of the nasal mucosa, there may be bleeding, nasal inflammatory secretions backflow into the pharyngeal mucosa, stimulate the mucous membrane of the throat area and cause coughing. 3. Cough nose bleeding may also be caused by hot and dry air, poor air quality and other factors. Cough nose bleeding may also be related to tumors, systemic diseases and other factors, it is recommended to consult a doctor to clarify the diagnosis.