Nosebleeds with clots indicate that the coagulation mechanism is activated, not a bad coagulation function. Nosebleeds may be related to dry weather, atrophic rhinitis, deviated nasal septum and other reasons, or it may be related to coagulation dysfunction, but patients with coagulation dysfunction will have blood flow and will not have clots, so if clots are present, bad coagulation can be ruled out. Nasal mucosa is originally thin and fragile, when the weather is dry, due to the evaporation of the protective mucus on the surface of the nasal mucosa, the nasal mucosa will rupture and bleed after losing the protective effect of the mucus. Atrophic rhinitis, due to atrophy of the nasal mucosa, also prone to rupture of small blood vessels under the mucosa bleeding. When the nasal septum is deviated, due to the excessive tension of the nasal mucosa on one side, so it is also easy to have nosebleeds. If the symptom of nosebleed persists or recurs, please consult the doctor in time to find out the cause and standardize the diagnosis and treatment.