Children’s unilateral nostrils always bleeding may be the environment dry, often digging nostrils, nasal septum deviation and other factors lead to. 1. Dry environment: dry environment is easy to cause the nasal mucosa dry, leading to the internal capillary rupture of the nasal cavity, thus appearing often nosebleed symptoms, the bleeding caused by this situation is generally not a lot. 2. Frequent digging of the nostrils: the distribution of blood vessels in the nasal cavity is rich and relatively fragile, if the child often digs one side of the nostrils, it may damage the capillaries inside the nasal cavity, thus causing recurrent bleeding in the nasal cavity. 3. Nasal septum deviation: may change the nasal passage, resulting in damage to the mucous membrane of the nasal cavity, or capillary rupture, thus triggering the symptoms of frequent unilateral nosebleeds in children. Children’s unilateral nostril bleeding may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.