They can occur on any day of the month.
Periods occur each month not each day Periods last a minimum of 5 days and can range to 7 days.
Every woman is a little different in this matter, but the average is about 28 days. That's not quite one calendar month, so a woman's periods will generally NOT correspond with the same day of each 30- or 31-day calendar month.
It isn't that abnormal to have two periods in a month. However, sometimes it can occur, if you have a short cycle and your period starts at the beginning of the month. This would make it possible to have two periods in one month.
If it's more then once a month you should see a doctor.
They occur in December and June, on the 21st or 22nd of the month.
This does occur sometimes, with periods. The skipped month is not always fully understood, but there can be a number of reasons behind it (most of them nonpathologic).
Periods occur as the lining of the uterus sheds in response to hormonal changes in the body. Each month, if an egg is not fertilized, the lining is no longer needed and is expelled through the vagina, resulting in menstruation. This cycle of shedding and renewing the lining of the uterus is what causes periods to occur.
This can occur as the menstrual cycle is usually every 28 days, so theoretically, one could have two 'periods' (one ending and another starting) within that 31 day window of a month.
All of them. Low tides occur just about twice a day in most places.
1 to 2 years after puberty not neciserily for all girls it also happens once a month
January 17 1995
However, episodic cluster headaches occur during oneto five-month periods followed by six to 24-month attack-free, or remission, periods. There is no such reprieve for chronic cluster headache sufferers.