The phase of the menstrual cycle when bleeding occurs in the uterus without fertilisation. This process usually lasts 3 to 5 days, repeats about every 28 days, and can produce a blood volume of 30 to 100 ml.
The phase of the menstrual cycle when bleeding occurs in the uterus without fertilisation. This process usually lasts 3 to 5 days, repeats about every 28 days, and can produce a blood volume of 30 to 100 ml.