Diagram Of Menstrual Cramps. Answer 1 of 2. Most people get their period every 21 35 days around once a month thats why periods are sometimes called.
The menstrual phase is the first stage of the menstrual cycle. Menorrhagia oligomenorrhea and polymenorrhea. The fertilized egg didnt travel to the uterus to attach to the endometrium of the uterus.
These hormones cause the lining of the uterus or womb to build up.
A period happens because of changes in hormones in the body. These can include cramps tender breasts tiredness and premenstrual syndrome. During your period a little bit of blood comes out of your vagina for a few days. In this video justin from the institute of human anatomy shows a cross section of the female reproductive system and explains the basic mechanics of perio.