The decrease in the levels of estrogen and progesterone.
Menstruation occurs at the start of the menstrual cycle and normally lasts around a week, so menstruation would occur days 1-7 of the menstrual cycle.
Normally every 30 days.
The uterine lining builds-up following ovulation in preparation for possible pregnancy, to allow the zygote to implant and nourish the growing 'baby'. If pregnancy doesn't occur the drop in progesterone triggers the uterus lining to break down, this is called menstruation.
Pain associated with Irritable Bowel Syndrome can occur any time, any place. There is no specific time that the pain will occur, but IBS pain is genrally "stronger" during menstruation.
No, a girl cannot be pregnant on her period. If a woman is pregnant then menstruation doesn't occur. Also a woman cannot get pregnant during menstruation - although she can get pregnant as a result of sex on her period.
Menstruation occur at the age of 9 to 16 years old
No.
Yes. Menstruation will still occur with out ovulation
Yes!
Menstruation occurs at the start of the menstrual cycle and normally lasts around a week, so menstruation would occur days 1-7 of the menstrual cycle.
If the egg is fertilized that means pregnancy has taken place. Hence, no menstruation.
on average every 28 days
Yes, Menstruation can also occur while pregnant, unless if she has menstruation disabilities.
of course not, menstruation occurs on the 14th day not the ovulation, and I say that the start of the menstrual cycle is actually menstruation.
Menstruation
Normally every 30 days.
The symptoms typically start a day or two before menstruation, usually ending when menstruation actually begins.