Blood clots in the nose may be caused by environmental factors, but also may be caused by trauma, nasal polyps and other diseases, as well as hypertension, leukemia, rhinitis and other diseases. 1. Environmental factors: the environment is too dry, the mucous membrane cracks and breaks down a small amount of bleeding, adherence in the nasal cavity, after accumulating more can be blown out or sucked back to spit out the blood clots. 2. Trauma: nasal vestibule or nasal inflammation caused by nasal discomfort, nose picking can often lead to nasal mucous membrane damage, which occurs in the nasal cavity chronic bleeding, the symptoms of blood clots in the nose. 3. Nasal polyps: nasal polyps are considered to be due to chronic inflammation or secretion stimulation, as well as metamorphosis and other reasons, including maxillary sinus hemorrhagic polyp surface is often oozing blood, brittle, easy to bleed when touched, so the patient will have the manifestation of the nose with blood clots. 4. Other: high blood pressure, leukemia, rhinitis and other diseases may also refer to patients with symptoms of blood clots in the nose. Patients with symptoms of blood clots in the nose, it is recommended to consult a doctor in time to identify the cause of the disease, and follow the doctor’s instructions for treatment.