Nostrils with paper sticky blood but does not flow out, indicating that the amount of nasal bleeding is relatively small, considering sinusitis, dry rhinitis, bad habits and other causes. 1. Sinusitis: an inflammatory disease of the sinus mucosa, mainly caused by bacterial, fungal and viral infections, which can lead to nasal congestion, pus and nasal discharge, as well as head and face pain and other symptoms, but also cause sinus mucosal congestion and edema, and paper poking the nose can easily lead to the phenomenon of bleeding. 2. Dry rhinitis: the nasal mucosa is dry, capillary fragility increases, when the patient sneezes violently or rubs the nose, it can lead to blood vessel rupture and bleeding. 3. Bad habits: if the patient often like to pick the nose with their hands, they will also accidentally pick the nasal mucosa to break, so it will cause a small amount of bleeding phenomenon, resulting in the nostrils with a paper sticking with blood but not out of the phenomenon. If the phenomenon of blood sticking to the nostrils with paper but does not flow out often, it is best to go to the hospital in time to improve the examination, to clarify the specific causes and active treatment.