The common causes of right nostril bleeding include bad habits, intranasal diseases and systemic diseases. 1. Bad habits: often picking the nose, blowing the nose with force, rubbing the nose, etc., can easily cause rupture of the intranasal mucous membrane, and there can be bleeding from the right nostril, which is common in children. 2. Intranasal diseases: if there are patients with rhinitis and sinusitis, the nasal secretion is more, and the thin mucous membrane is easy to cause intranasal bleeding, which can be seen in the unilateral nasal cavity; part of the patients with deviated septum, especially the thin mucous membrane at the deviated place, which is easy to cause unilateral nasal bleeding when exposed to the cold air or when blowing the nose; a small number of patients with the right intranasal tumors, which cause the mucous membrane rupture, and the right nosebleed performance. 3. Systemic diseases: such as leukemia, severe liver dysfunction, hypertension, etc., which can easily cause intranasal bleeding and can be seen unilaterally. Therefore, it is recommended to consult a doctor in time when nosebleed occurs, make a clear diagnosis, and follow the doctor’s instructions for treatment.