Bleeding from nose blowing but no nosebleed may be caused by dry weather, as it may be caused by trauma to the nasal mucosa, atrophic rhinitis and so on. 1. Dry weather: If the weather is dry, the nasal cavity may be dry, and the nasal mucosa may rupture when the patient blows his nose, resulting in the symptom of bleeding from nose blowing but not nosebleed. 2. Trauma: If you frequently pick your nose or your nose is touched, it is easy to rupture the mucous membrane of the nasal cavity, which will cause a small amount of bleeding in the nasal cavity. At this time, the patient will have bleeding when blowing the nose, but no nosebleed. 3. Atrophic rhinitis: The abnormal enlargement of nasal cavity in patients with atrophic rhinitis will cause enlargement of nasal cavity, which will lead to hyperventilation, and patients will have dry nasal cavity. At this time, the patient blowing the nose will damage the mucous membrane of the nasal cavity, and there will be bleeding when blowing the nose, but no nosebleed. If there are repeated episodes of nose blowing with bleeding, but no nosebleed, it is necessary to actively consult a doctor to clarify the diagnosis and follow the doctor’s instructions for treatment.