In general
Nosebleeds are very common in children.
The most common cause is a child picking his/her nose, especially when he/she has a cold and nasal congestion.
During a cold, the mucous membrane lining inside the nose is swollen and tender, and blood vessels can break easily and start to bleed. The bleeding most often comes from a little blood vessel on the septum, the wall between the nostrils, at the very front of the nose.
Dry winter air and nasal allergies also make the nose more likely to bleed.
Although it may look like a lot of blood, almost all nosebleeds will stop on their own within 5 minutes, and it is seldom necessary to seek medical advice.



