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One, when your period is skipping or infrequent. For example, if you typically have a period once every month, but after one period in February, there is no period in March, but your period returns in Aprilthis skipping is considered an irregular period. Two, when your period is suddenly different.
For example, if you typically have a period that lasts five days with a moderate menstrual flow, but suddenly you are experiencing very heavy, ten-day long periods. This sudden shift in the nature of your periods would also be considered irregular. Third, if your period has been nonexistent for several months. Missing your period is considered an irregular period.
If you have missed your period or have been having an irregular period, you might be upset, frustrated, and worried.
This way, you will be much more prepared to deal with them if they happen to you.
Regular periods? When doctors ask, Is your period regular? they usually mean: Is your period generally consistent? As you know, every womans period is different. What is normal for you may not be normal for your mother, your best friend, or the neighbor down the street. Some women experience menstrual bleeding for only a day or two, while others experience a week to ten days of menstrual bleeding.
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Source: (irregular periods) http://irregularperiods.info/