A clot in the nose that does not bleed indicates that the nosebleed is not large and the clotting function is normal. The causes of nosebleed include environmental factors, trauma, inversion papilloma, dry rhinitis and so on. 1. Environmental factors: due to the climate and environment of cold, dry, can be induced by the nasal mucosa rupture a small amount of bleeding, blood stopping can appear in the nose after the phenomenon of blood clots do not bleed. 2. Trauma: If the nasal mucosa is damaged due to excessive force when digging boogers, there will be blood clots after the blood stops. 3. Inverted papilloma: it may be related to human papilloma virus infection. Tumor growth can destroy the surrounding tissues, according to the tumor has local erosion and destructive force, easy to recurrence and malignant characteristics, blood vessel rupture and bleeding when tumor growth, blood clots can be found after the blood stops, and there may not be a large amount of obvious bleeding. 4. Dry rhinitis: the nasal mucosa is dry, the secretion of glands is reduced, the surface of nasal turbinate is crusted, and the blood seeps out after the crust is shedding to form blood crusts and blood clots, but there will be no obvious bleeding. The phenomenon of blood clots in the nose without bleeding, please consult a doctor in time for a systematic examination to clarify the diagnosis, and follow the doctor’s instructions to standardize the treatment.