The causes of nosebleeds in pregnant women mainly include the following aspects: 1, fire: due to dry air, it is easy to catch fire during pregnancy, which leads to dry nasal cavity and increased vascular brittleness, resulting in nosebleeds; 2, bad habits: such as picking the nasal cavity, digging nostrils and other external stimuli, which leads to nasal bleeding; 3, physiological factors: after pregnancy, pregnant women will secrete a large amount of progesterone in the body, causing blood vessels to expand and congestion. At the same time, the blood volume of pregnant women is higher than during non-pregnancy, while the normal human nasal mucosa is richer in blood vessels and the vessel walls are thinner, so it is easy to rupture and cause bleeding. Especially when pregnant women after a full night’s sleep, get up after a change in position or blowing the nose, more likely to bleed; 4, compensatory menstruation: under normal circumstances, menstruation stops during pregnancy, some pregnant women appear “compensatory menstruation” mainly nasal mucosal bleeding; 5, vitamin K deficiency: if pregnant women do not absorb enough vitamin K, the blood 5, vitamin K deficiency: if the pregnant women do not absorb enough vitamin K, the blood thrombin is reduced, easily cause coagulation disorders, not only prone to nosebleeds, but also can cause the fetus congenital visual and intellectual development disorders. It is recommended that pregnant women eat more foods rich in vitamin K, such as cabbage, lettuce, sauerkraut, etc. In summary, there are more reasons for nosebleeds in pregnant women. If nosebleeds occur during pregnancy, it is important to visit the ENT department in time to find out whether the bleeding is caused by nasal mucous membrane bleeding or coagulation dysfunction and other diseases, so as to provide early and symptomatic treatment.