Nosebleeds can be caused by dry climate, trauma, inflammation, abnormal coagulation function and other factors, while blood clots are blood clots formed by coagulation of blood in the nasal cavity. 1. Dry climate: due to climatic factors, when the weather is dry, it can lead to dry crusting of nasal mucosa, which can lead to the appearance of nosebleeds, and when the crusts are large, the performance of blood clots may appear. 2. Trauma: Nose trauma, nose picking, nose blowing, etc., can lead to damage to the nasal mucosa, nosebleeds can appear with blood clots. 3. Inflammation: acute and chronic rhinitis, allergic rhinitis, atrophic rhinitis and other inflammatory diseases involving the nasal mucosa can also lead to symptoms of blood clots in nosebleeds. 4. Abnormal coagulation function: when abnormal coagulation function occurs, it is more likely to lead to nasal bleeding, and the nasal blood will also be coagulated into blood clots, and the time of blood coagulation will be prolonged. Nosebleeds with blood clots should be treated in time, under the guidance of specialists and actively carry out appropriate treatment, which will help to relieve the discomfort symptoms as soon as possible.