There are many reasons for the old blood clots in the nasal cavity in recent days, such as rhinitis, dry nasal mucosa, bleeding nasal polyps and so on. 1. Rhinitis: If there is an inflammatory reaction in the nasal cavity, it will cause congestion, edema and erosion of the nasal mucosa, which will result in the phenomenon of blood clots in the nasal cavity. 2. dry nasal mucosa: the autumn and winter seasons can lead to the nasal mucosa is too dry, especially will lead to the nasal cavity capillary fragility increase, leading to local small artery bleeding, rupture, so it will cause the phenomenon of the nasal cavity always have blood clots. 3. hemorrhagic nasal polyps: hemorrhagic nasal polyps due to chronic inflammation, metabolic reactions and other factors, can lead to increased permeability of the nasal mucosa of small blood vessels, plasma exudation, resulting in localized ulceration, vesiculation, bleeding, bleeding, bleeding, and timely coagulation, which will appear in the nasal cavity always have blood clots. There are many reasons why there are always clots in the nasal cavity, if the symptoms are not relieved, it is recommended that the patient go to the hospital in time to improve the examination, a clear diagnosis, and then take standardized treatment under the guidance of a professional doctor.