Most girls get their first period between the ages of 10 and 15, but some get it earlier and some later. The first period is known as menarche pronounced: MEN-ar-kee. A girl's monthly cycle is the number of days from the start of her period to the start of the next time she gets her period.
You often hear this is a day cycle. But 28 is just an average figure that doctors use. Cycle lengths vary — some are 24 days, some are 34 days. And a girl may notice that her cycles are different lengths each month — especially for the few years after she first starts getting her period.
Early in a girl's cycle, her ovaries start preparing one egg. At the same time, the lining of the uterus becomes thick to prepare a nesting place for a fertilized egg in the event that the girl becomes pregnant. About 2 weeks before a girl gets her period, the egg is released from the ovary this is called ovulation.
The egg travels through the fallopian tube into the uterus. If the egg isn't fertilized by sperm, it starts to fall apart. Then the lining and egg leave a girl's body as her period and the whole thing starts all over again — that's why we use the word "cycle. Working exercise into your schedule on a daily basis is great, but excessive exercising could lead to lower levels of estrogen , which is the hormone that regulates the female reproductive process.
A little stress in your life is fine, but chronic stress can throw your body out of balance. Stress activates the hormone cortisol and pushes your body into survival mode. If you are experiencing prolonged stress, your body can induce amenorrhea and will prevent menstruation.
Switching to the night shift or traveling to another time zone may prevent your menstrual cycle from starting. According to a study published in Frontiers in Endocrinology , any disruptions to your circadian rhythm —the internal clock that regulates important cellular processes —can cause you to experience irregular periods.
A study on the effect of antipsychotics on menstruation found that amenorrhea occurred because prolactin levels were imbalanced.
Additionally, some birth control medications, such as an IUD, implant or shot, may cease your periods while on them. A pituitary tumour is an abnormal growth of cells that originates in the pituitary gland, located in the brain. It secretes a wide variety of hormones, including growth hormone, thyroid-stimulating hormone, adrenocorticotropic hormone, luteinizing hormone , follicle-stimulating hormone , and prolactin.
Depending on where in the pituitary gland the tumour is growing, production of any of these hormones can be impacted. Pituitary tumours are almost always benign. There is a very wide range of symptoms that can be caused by a pituitary tumour, depending on its location and what type of hormone s the tumour is producing. They can exert a wide range of effects on menstruation, and can cause periods to become irregular or stop altogether.
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