Thank you for posting.
Most nosebleeds are minor and can be stopped if you apply direct pressure by pinching your nostrils shut for 10 minutes (more information on this in the link below). Bleeding in the back of the nose (posterior epistaxis) may cause a heavy nosebleed that continues after 10 to 20 minutes of home treatment. This type of nosebleed is less common and usually requires medical treatment to stop the bleeding.
We can't say what is causing your nose bleeds. Common causes are - dry air, trauma to the nose from an injury, deformities inside the nose, inflammation in the nose from colds, allergies or sinus infections; in rare cases, intranasal tumors. Any of these conditions can cause the surface blood vessels in the nose to bleed. See your doctor for an evaluation.