The nose blowing nose bleeding, may be dry rhinitis, may also be chronic sinusitis, fungal sinusitis or nasal cavity long things, nasopharyngeal diseases, etc., as follows: 1, dry rhinitis: some patients have ulceration of the mucous membrane of the front of the inferior turbinate, ulceration of the mucous membrane of the nasal septum Richter area, blowing the nose in the process, the ulceration may bleed, thus manifesting as blood in the snot. 2, chronic sinusitis, fungal sinusitis The patient has the above sinus inflammation, blowing the nose may be accompanied by sinus or nasal cavity mucous membrane erosion, which can be manifested as blood in the snot. 3, nasal cavity long things: such as nasal cavity inversion papilloma, olfactory neuroblastoma, sinus malignant tumor, etc., may appear in the performance of blood in the snot, such blood may be related to the local breakdown of the swelling, or swelling invasion of the nasal cavity mucosa and nasal cavity blood vessels. 4, nasopharyngeal diseases: some patients have malignant lesions in the nasopharynx, such as nasopharyngeal carcinoma, can also appear blood in the snot. Of course, this kind of is mostly manifested as blood in the retracted snot.