A period, or menstruation, is the shedding of the lining of the womb. Menstruation is also known as menses. Menses are part of normal sexual health for women during their reproductive years.

Menstruation that includes bleeding from the vagina is found mainly among humans and similar animals, such as primates.

The endometrial tissue is shed from the womb and is released through the vagina.

Women have a period approximately every 28 days; however, there is some variation in this cycle, ranging from a 24-day to a 35-day cycle. A period is part of the woman’s menstrual cycle. It is a sign that the body is working normally.

Fast facts on menstruation

Here are some key points about menstruation.

  • Periods normally start between the ages of 8 and 16 years.
  • On average, around 5 to12 teaspoons of blood are shed.
  • Symptoms of premenstrual syndrome (PMS) include bloating, irritability, and breast tenderness.
  • Irregular periods  affect many women, but if you are concerned, you should see a doctor.

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