“The average woman’s menstrual cycle is 28 days. However, there are also different. Technically, a normal menstrual cycle is between 21 to 35 days, “Rankin said, as quoted from She Knows. If your menstrual cycle time changes, it is a variation and normal.

In addition, identify the cause of the menstrual cycle also change or even stopped for some time. Namely:

1. Diet and exercise
   Diet and exercise can affect your menstrual cycle. “If you practice hard enough, but insufficient food intake, your body will conclude you are not fit to become pregnant. Levels of estrogen decline and ovulation would be disrupted or even stopped,” said Rankin. This means that someone could have a strict diet and hard exercise like an athlete, do not experience menstruation for some time. This is called hypothalamic amenorrhea.
2. Weight loss
   As well as diet and exercise, if you reduce your food intake drastically, the body will conclude you are not in good health for pregnant and affect the process of ovulation. Likewise if you are overeating and weight gain or obesity, estrogen will increase and create irregular menstrual cycles, or the term is called menorrhagia.
3. Contraception
   If the use of contraceptives like the pill or IUD menstrual cycle becomes irregular should immediately consult. According to dr. Rankin it indicates there is abnormal.

[source:vivanews.com]