During mid-cycle LH (Luteinizing hormone) begins to rise sharply, and ovulation occurs about 36 hours after the beginning of its rise. LH causes the final maturation of oocytes and stimulates the synthesis of progesterone in the follicle. The first part of the cycle is the one just prior to ovulation, and is called the proliferative (proliferation means increase; and in that time follicles and hormonal levels grow, and also the thickness of the lining of the uterus). The first phase of the cycle is also called the follicular phase.
The second part of the cycle is called Luteal (the yellow body, corpus luteum) or secretory phase. In ovulation wall of leading follicle bursts, which by then is the size of 22-28 mm, and the ovum is expelled into the fallopian tube. If there are sperm in the fallopian tube, egg cells can be fertilized.
Some women recognize ovulation, as a sharp pain in lower abdomen (so called mittleschmerz) and sometimes by light bleeding that can occur. As in ovulation the follicle wall bursts, in rare cases it can burst out precisely where the blood vessels are located and thus cause bleeding. This causes more symptoms - the blood can collect in the abdomen, and the so called. peritoneal irritation appear (pain, vomiting), or in the ovary, which also causes pain due to the increase of ovaries. Most of these cases ends well, the bleeding stopps, and there is no need for medical intervention.
To learn about other ovulation symptoms visit ovulationsigns.net
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