During pregnancy, the capillary fragility of nasal mucosa increases due to endocrine disorder, which increases the probability of epistaxis in pregnant women. If the amount of bleeding is relatively large, it may flow backward through the back nostril to the oral cavity and cough up. In addition to this reason, we should also consider the following factors that lead to epistaxis, local causes: first, trauma, forceful blowing of the nose, hand picking of the nose, severe sneezing, which may damage the nasal mucosa and lead to bleeding; 2、 Nasal cavity foreign body, manifested as epistaxis on one side or bloody discharge; 3、 Inflammation, usually chronic rhinitis and sinusitis, can damage the nasal mucosa and cause bleeding; 4、 Tumors, whether benign or malignant, cause bleeding when the surface of the tumor breaks; 5、 Deviation of nasal septum leads to mucosal erosion and bleeding. Systemic etiology: First, acute febrile infectious diseases, such as influenza and hemorrhagic fever; 2、 Diseases of cardiovascular system, such as hypertension, arteriosclerosis, etc; 3、 Diseases of the blood system, such as thrombocytopenic purpura, leukemia, etc; 4、 Chronic diseases of the liver and kidney system.
