Menstruation is a common process that takes place in any woman and PMS are the symptoms most women experience at one point or another with varying degree. The egg production, copulation, growth of 
embryo, etc are due to the various hormones that are released during menstruation. Right from the start of the month, the menstrual cycle starts. Any delays in the menstrual cycle can lead to various problems.
Although the menstruation cycles are regular in women, many people have less or no idea about them. We will now see more about this topic.
There are four phases in menstruation cycle. These phases occur in the women body throughout the month. The phases start from the preparation for growth of an egg to the production of complete egg.
First phase
This phase is known as “menstrual phase”. The menstrual phase starts from the day 1 and ends on day 5. In this phase, the bleeding occurs normally in the respective organs. The unnecessary material in the uterus lining is also sent out. This process is the preparation for growth of an egg.
Second phase
This phase is termed as “follicular phase”. In this phase, the formation of an egg takes place. The period of this phase is from day 6 to day 14. During follicular phase, the cell growth can be observed in the follicles. This cell growth will lead to the formation of an egg.
The hormones named as FSH (Follicle Stimulating Hormone) and LH (Luteinizing hormone) are responsible for the formation of an egg. The FSH hormone acts on the ovaries and helps in the production of eggs. The LH hormone stimulates the ovaries to release the egg. Both these hormones are released in this phase.
Third phase
In third phase, the LH hormone value increases in the women. This hormone is responsible for the traveling of the egg through the fallopian tube. The chances for becoming pregnant are ripe in this condition. Hence this phase is known as “ovulation”. Ovulation occurs on the 14th day of the menstrual cycle.
Fourth phase
This phase is known as luteal phase and it ranges from the 15th to 27th day. In this phase, some eggs are developed in sacs and the estrogen hormone is released. The matured egg is released thereafter and the production of progesterone also increases.
The estrogen and progesterone are very important in the development of embryo. Estrogen helps to thicken the uterus and the progesterone helps in the embryo growth. Various organs of the baby will mature due to the estrogen.
If there is no copulation, the estrogen and progesterone quantity decreases after fourth phase. Due to this process, the uterus lining breaks and is passed through the vagina. This is all about the menstrual cycle.
