Nasal bleeding occurs commonly as a result of dry air, according to Healthline. Nasal injury, allergies, chemical irritants, aspirin overdose and cold air also cause nasal bleeding. Although most nosebleeds, especially occasional ones, result from less serious conditions and subside without treatment, frequent nasal bleeding may be due to a serious underlying cause such as cancer, hypertension and a bleeding disorder. An individual should visit a doctor immediately when serious signs, such as difficulty breathing, accompany nosebleeds, says Mayo Clinic.
Dry air causes drying out of the nasal membranes, resulting in itchy internal nasal crusting, which causes nasal bleeding upon scratching, explains Healthline. Causes of dry air include dry climate and central heating systems. Nasal membranes dryness can also be a side effect of allergic decongestants and antihistamines.
Nasal bleeding, or epistaxes, is a condition in which an individual bleeds from the internal part of the nose as a result of damaged nasal blood vessels, notes Mayo Clinic. Two nosebleed types include anterior nosebleed, which results from breakage of front nasal blood vessels, and posterior nosebleed, which results from breakage of blood vessels that are located deep in the nose or nasal back, states Healthline. In posterior nasal bleeding, the nose bleeds into the throat, rendering the condition possibly dangerous.