Patients with allergic rhinitis may have blood inside the nose, often because the patient’s nasal mucosa is in a state of hypersensitivity, often with inflammatory exudates, and the blood vessels are obviously congested, so there will be obvious blood from the appearance. Sometimes it is because patients blow their noses hard, which also easily leads to the formation of blood on the surface of nasal mucosa or turbinate mucosa, or even rupture and blood inside the nasal mucosa. Patients must actively treat the symptoms, consider spraying with mometasone furoate nasal spray to reduce the symptoms of allergic rhinitis, and if necessary, add loratadine dispersible tablets for anti-allergy. Patients must exercise more in their lives to improve their resistance to avoid triggering allergic rhinitis, which can lead to the formation of blood inside the patient’s nose.