Dysfunctional uterine bleeding (DUB) is irregular vaginal bleeding that is not caused by a
serious medical condition.
Normally one of your
ovaries releases an egg during your
menstrual cycle. This is called ovulation. Most women who have dysfunctional uterine
bleeding get it when their ovaries don't release an egg. This can be caused by
abnormal hormone changes. When your hormone levels are out of
balance, they can affect the
lining in your uterus, causing bleeding. Dysfunctional
uterine bleeding is common before age 20 and after age 40.