Cough with nosebleed is a symptom of many diseases, such as upper respiratory tract infections, environmental factors, nasopharyngeal tumors, allergic rhinitis and so on. 1. Upper respiratory tract infection: upper respiratory tract infection can cause cough with nosebleed, and may also be accompanied by coughing up phlegm, nasal congestion, runny nose and other symptoms. 2. Environmental factors: dry air can also cause cough and nosebleed, due to the dry weather caused by the nasal mucosa is dry, fragile, thus causing a runny nose, but also may cause a slight cough. 3. Nasopharyngeal tumor: Nasopharyngeal tumor can also cause cough with nosebleed, especially nasopharyngeal cancer, which can cause recurrent nasal bleeding, sputum with blood and cough in the early stage. 4. Allergic rhinitis: allergic rhinitis can cause cough with nosebleed, accompanied by nasal congestion, runny nose, nasal itching, etc. Due to untimely treatment, the inflammation will invade into the throat, so it will be accompanied by coughing symptoms. The symptoms of cough and nosebleed, it is recommended that patients go to the hospital in time to improve the examination, follow the doctor’s instructions to take standardized treatment, do not ignore the symptoms, take it lightly.