Hello, 
The commonest cause of nose bleeding is 
nose-picking & drying of the nasal mucosa.  
It can be due to injury, allergy, 
sinusitis, 
high blood pressure & sometimes bleeding disorders (use of blood thinning medications). 
Alcohol abuse is also a cause.
Cut on alcohol intake & addictions if any. Avoid blowing out your nose too hard. Stop picking nose. Do not take medicines like Ibuprofen or 
clopidogrel without the prescription of your treating doctor.
Visit ER & get physically examined, get Imaging tests & investigations done to detect the pathology causing the defect.
In the meantime, keep your nasal mucosa moist by applying vaseline, Neosporin or bactracin ointment. Get treated at the earliest.
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Dr Nupur K, General & Family Physician