A bloody nose is not necessarily cancer. Dry nasal mucosa, ruptured nasal blood vessels, allergic rhinitis, deviated nasal septum, sinusitis, nasal tumors, as well as other diseases, such as leukemia, hypertension, diabetes and so on, can also appear in the nasal mucus with blood in the symptoms. There are many reasons that cause blood in nasal mucus, the mucous membrane of nasal cavity is relatively fragile, blood vessels are densely distributed and less protected, in a dry environment, it may be due to forceful blowing of the nose, resulting in nasal mucous membrane rupture or vascular osmotic pressure increase and bleeding, such a case of less bleeding, so it is manifested as nasal mucus with blood in the nose. Secondly, blood in the nasal mucus may be caused by colds and flu. Cold viruses enter the nasal mucosa, resulting in swelling of the nasal mucosa, and the capillaries under the mucosa become very fragile, which will rupture when blowing the nose, resulting in blood in the nasal mucus. It is also possible that the curved nasal septum causes rhinitis, resulting in blood in the nasal mucus. In addition, patients with nasopharyngeal cancer may also have symptoms of blood in the nasal mucus. There are also some systemic bleeding disorders that can cause blood in the snot, such as hemophilia and thrombocytopenic purpura. If the condition of blood in the nose recurs, it is important to go to the hospital for further examination through sinus endoscopy and sinus CT to see if there is any serious condition. Blood in the nose is a common symptom in life, and patients are advised not to be nervous. Simply manifesting the symptom of blood in the nose, the possibility of patients suffering from cancer is very low.