Nasal discharge with blood in winter is mostly considered to be caused by dry climate, nasal mucosal blood vessel damage, commonly caused by nasal cavity diseases and systemic diseases. 1. Environmental dryness: winter snot with blood, often accompanied by nasal dryness, dry itchy pain, etc., this time to consider and dry climate related to the nasal mucosal blood vessel damage, can be given to the nasal cavity humidification and other physical therapy, or the use of sea saline nasal spray to alleviate the symptoms. 2. Nasal disorders: winter is easy to suffer from colds, may suffer from rhinitis, sinusitis, caused by increased nasal secretions, nasal mucosa congestion and swelling, blowing the nose will cause physical damage to the nasal mucosa, resulting in a small amount of blood seepage; deviated septum, deviated side of the mucous membrane thinning by the impact of the dry airflow, which can lead to local mucous membrane erosion and bleeding; nasal hemangiomas and nasal cavity swelling to destroy the mucous membrane of the nasal cavity can also lead to nasal mucus with blood. 3. Systemic diseases: the big temperature difference between indoor and outdoor in winter can easily lead to hypertension, blood pressure fluctuation; blood system diseases, liver and kidney system and oral anticoagulant drugs can cause coagulation abnormality, and the phenomenon of bloody nasal mucus can also occur. In short, if the nasal cavity with blood, it is recommended to go to the hospital, diagnosis and clear treatment.