Young children with black blood in the nose in the morning is mostly caused by bleeding at night after coagulation, leading to the occurrence of this symptom of diseases such as nasal septum deviation, dry rhinitis. 1. Deviated nasal septum: it refers to the abnormal position of the nasal septum, which can cause nasal dysfunction such as nasal congestion, headache, nosebleed and other symptoms, nosebleed occurs mostly in the surface of the surface, may be due to the night time air is dry and dusty, resulting in bleeding at night, leading to the occurrence of this symptom. 2. Dry rhinitis: it is a chronic inflammation of the nasal mucosa, usually without atrophy of the nasal mucosa and nasal turbinates. Clinical symptoms can be manifested as nasal congestion, dryness inside the nose, dry nose bleeding and other symptoms. When unconsciously rubbing the nose at night due to dryness inside the nose, it may lead to the occurrence of nose bleeding. There may also be other reasons why a toddler has black blood in his nose in the morning, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor. There may also be other reasons, it is recommended to go to the hospital, improve the examination to clarify the cause, under the guidance of the doctor to give targeted treatment or treatment.