Hesperian Health Guides
Chapter 22: Abnormal Bleeding from the Vagina
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If monthly bleeding suddenly changes, always think about the possibility of pregnancy—even if a family planning method is being used.
It is normal for monthly bleeding to change from time to time because of illness, stress, pregnancy, breastfeeding, a long journey, overwork, or a change in diet. But if a change in monthly bleeding happens suddenly, lasts more than a few months, or if it comes with other problems, it may be a sign of a more serious problem.
If a woman has any of these danger signs, she may need medical help right away. Click on the links listed for more information.