Menstrual cycle is a process which begins after the attainment of puberty, during which many physical changes take place, suggesting body’s preparation for pregnancy in women. Every month, blood and tissue which contribute menstrual bleeding, are discharged from the uterus through vagina, which normally lasts for 3 to 5 days. This is more commonly known as a period. Mostly periods start around 12 years but may vary between 8 and 16 years.
Menstruation is associated with many symptoms. Abdominal cramps, headache, soreness in breasts, muscle pains and exhaustion are common among menstruating women. About a week or two before the menstrual period, most women experience Premenstrual Syndrome(PMS), a condition that occurs as a result of hormonal fluctuations. Effects of PMS include anxiety, depression and high emotional sensitivity. If symptoms persist, it is better to consult a healthcare professional. Moderate exercise helps in alleviating some of these symptoms, but you should keep in mind not to overdo it.
Menstrual cycle is controlled by the hormones and is counted from the first day of the period to the next start of period. This monthly phase takes about 28 days and may vary among different women. A slightly shorter or longer menstrual cycle is also considered normal.
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Source: womenhealthzone