5-year-old boy in recent days, nosebleeds, the amount is not much, consider is due to the air in the dry, digging nostrils, acute and chronic rhinitis, vitamin deficiency and other factors caused by. 1. Dry air: If the air is dry recently, the humidity is not enough, can make the nasal mucosa dry, leading to the nasal mucosa capillary dry cracks, resulting in 5-year-old boy in the past few days nosebleed, bleeding is not much. 2. Digging the nostrils: 5-year-old boys due to discomfort in the nasal cavity, digging the nostrils, can make the nasal mucosa rupture, causing nosebleeds, bleeding not much. 3. acute and chronic rhinitis: acute and chronic inflammation of the nasal mucosa can lead to nasal mucosal congestion and swelling, local mucosal erosion rupture and bleeding, resulting in 5-year-old boys these days nosebleeds, not much bleeding phenomenon. 4. Vitamin deficiency: 5-year-old boy life if partiality or picky eating, will make the body of vitamin C and other substances lack, thus causing changes in vascular fragility, and affect the coagulation process, resulting in the little boy these days nosebleed, flow not much phenomenon. A small amount of nosebleeds, but also may be caused by other reasons, it is recommended to go to the hospital, diagnosis is clear and follow the doctor’s instructions for treatment.