The child is fourteen years old every now and then on the nosebleed may be bad habits, infection factors, blood diseases and other factors. 1. Bad habits: fourteen-year-old children have the bad habit of picking their nostrils, frequently picking their nostrils, causing irritation to the nasal mucosa, they will often have a nosebleed. 2. Infectious factors: for example, chronic sinusitis, due to pus stimulation, there will often be nosebleeds, accompanied by nasal congestion, runny nose, olfactory dysfunction and other symptoms. 3. blood diseases: such as hemophilia and other blood clotting disorders, will often appear nosebleeds, may also often have skin bleeding, hematuria and other abnormal manifestations. If your child is fourteen years old and has nosebleeds every now and then, along with other abnormal manifestations, there may be disease factors, and it is recommended that you seek medical examination and treatment.