Menstruation or your menstrual period is the regular shedding of the uterine lining about 14 days after ovulation if pregnancy did not happen. Your menstrual period (as well as 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.

Menstrual cycle abnormalities are often related to hormonal 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
  • AmenorrheaNo menstrual period, no menstrual bleeding, or missed period
  • Primary Amenorrhea: When a woman has not yet had her period by the age of 16
  • Secondary AmenorrheaWhen the menstrual period stops after a woman already had regular cycles and periods (2 of the most frequent diagnoses for 'secondary amenorrhea' are pregnancy and menopause)
  • Menorrhagia: regular but heavy bleeding during a menstrual period or prolonged menstrual bleeding (more than 5-8 days)
  • Metrorrhagia: irregular timing of the menstrual periods (usually more frequent periods)
  • Menometrorrhagianot only irregular, frequent periods, but ones that are particularly heavy as well
  • Oligomenorrhea: less than 8 periods a year or cycles coming less frequently than every 35 days, which can be a sign of PCOS
  • Dysmenorrhea: very painful periods

Read More:
Why Am I Not Ovulating?
When Am I Most Fertile?
Pregnancy Symptoms: Early Signs You May Be Pregnant