Pregnancy can make the blood vessels in your nose expand, and your increased blood supply puts more pressure on those delicate vessels, causing them to rupture more easily. That's why nosebleeds are common during pregnancy – 20 percent of pregnant women have them, compared with 6 percent of nonpregnant women.
Fortunately, the occasional minor nosebleed is usually harmless. Some doctors say even a few nosebleeds over the course of pregnancy aren't cause for alarm.
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