The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the
Naturally … See more

Only two-thirds of overtly normal menstrual cycles are ovulatory, that is, cycles in which ovulation occurs. The other third lack ovulation or have a short luteal phase (less than ten days ) in which progesterone production … See more

Although a normal and natural process, some women experience premenstrual syndrome with symptoms that may include acne, tender breasts, and tiredness. More severe symptoms that affect daily living are classed as … See more

Most female mammals have an estrous cycle, but only ten primate species, four bat species, the elephant shrews and the Cairo spiny mouse (Acomys cahirinus) have a menstrual cycle. The cycles are the same as in huma… See more

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