Blood that drains from the nostrils is commonly called a nosebleed, although its technical term is epistaxis. The nose is lined with lots of small blood vessels. If those blood vessels are disturbed, they may cause spontaneous nosebleeds. Children between the ages of 2 and 10 years old may be more susceptible to spontaneous nosebleeds, which are usually not life-threatening and can be treated rather easily.
Low Humidity
Low humidity causes the inner lining of the nose to become dry, which makes nosebleeds occur much easier. When the mucous membranes that protect the blood vessels become dry, the thin layer of skin may rupture, causing a spontaneous nosebleed. According to MedlinePlus, nosebleeds occur more frequently during the winter because of the drop in temperature outdoors and dry heat indoors. Cold air that travels through the nostrils will also cause the inside of the nose to become dry and easily irritated as well. It may also be more common to experience spontaneous nosebleeds at the beginning of seasonal changes as well.
Medication
Medications that are blood thinners easily contribute to spontaneous nosebleeds. The most common medications that are connected to frequent nosebleeds are aspirin, heparin and Plavix. These medications prevent blood clotting. According to Trinity Mother Frances Hospitals and Clinics, common cough medicines may also promote nosebleeds as well as oxygen and some medications that must be administered through the nostrils. Medications can cause a nosebleed at any time of the year and especially if they are taken on a regular or consistent basis.
High Blood Pressure
More serious spontaneous nosebleeds that may require medical attention are caused by high blood pressure. Nosebleeds in the interior of the nose are much more difficult to stop and usually come without warning. According to MayoClinic.com, medical attention is required if the bleeding lasts for longer than 20 minutes or bleeding reoccurs after it has subsided. High blood pressure and hardened arteries may cause the interior blood vessels to rupture, causing uncontrollable bleeding from the nose. There may not be any signs a nosebleed will occur. Interior nosebleeds are very rare and do not happen frequently, notes MayoClinic.com.
