Menstruation or menstrual period is the regular shedding of the uterine lining about 14 days after ovulation if pregnancy did not happen. Your menstrual period (and also your menstrual cycle) begins on the first day you see bright red blood. Your menstrual cycle begins on the first day of your menstrual period and it ends on the day before the next period begins. A normal menstrual period is between 3-7 days long, and a normal menstrual cycle is between 21 and 35 days long with an average of 28 days.
Abnormalites of the menstrual cycles are often related to hormonal problems such as ovulation problems.
Doctors use words to describe certain abnormalities of the menstrual cycle:
- Eumenorrhea - a normal menstrual cycle that has no abnormalities of flow, timing, or pain
- Amenorrhea - No menstrual period, no menstrual bleeding, missed period.
- Primary Amenorrhea - When a woman never had her period by the age of 16 years
- Secondary Amenorrhea - When the menstrual period stops after a woman already had regular cycles and periods (2 of the most frequent diagnoes for 'secundary amenorrhea' are pregnancy and menopause)
- Menorrhagia - regular but heavy bleeding during a menstrual period; also, prolonged menstrual bleeding (>5-8 days).
- Metrorrhagia - irregular timing of the menstrual periods (usually more frequent periods).
- Menometrorrhagia -not only irregular, frequent periods, but ones that are particular heavy as well.
- Oligomenorrhea - less than 8 periods a year or cycles coming less frequent than every 35 days, which can be a sign of PCOS
- Dysmenorrhea - painful periods.