Properly controlling a nosebleed by sitting upright, leaning slightly forward and pinching the nose shut for about 10 minutes reduces the chance of expelling a blood clot. This allows a strong blood clot, which is necessary to stop the bleeding, to form, according to Hemophilia of Georgia.
Hemophilia of Georgia also suggests gently blowing out weak, jelly-like clots since they inhibit the stronger clot from forming. Mayo Clinic recommends blowing forcefully to clear out blood clots if rebleeding occurs after a nosebleed stops.
Blood clots are required to prevent and stop nosebleeds. Individuals who are taking blood thinners or undergoing chemotherapy are more likely to have nosebleeds. These situations are serious because of the reduced ability of the blood to clot, notes Dr. Jennifer J. Brown for Everyday Health.
Most nosebleeds occur, according to Mayo Clinic, because the membrane in the nose becomes dry due to dry air, allergies, the use of antihistamines or decongestants, or some other type of irritation. Because the nose contains many blood vessels and veins close to the surface, bleeding can occur. Using humidifiers to moisten the air, saline or other ointments to moisten nasal membranes and reducing the use of decongestants are recommended for preventing nosebleeds.