Menstruation, which is also known as a period or monthly, is the regular discharge of blood and muscular tissue (known as menstruation) from the inner lining of the uterus through the vagina. The first period usually starts between the ages of twelve and fifteen, which is known as a point in time. However, periods can sometimes start from the age of eight and still are considered to be normal. The average age of the first period is usually in the developing world and later in the developed world. The normal length between the first day of a period and the first day of the next day is 21 to 45 days in young women and 21 to 31 days in adults (on average 28 days). The bleeding usually lasts for approximately 2 to 7 days. Menopause closes after menopause, which is usually between the ages of 45 and 55 years. Periods also stop during pregnancy and usually do not start again during the early months of breastfeeding.
80% of women have information about some symptoms before menstruation. Common signs and symptoms include acne, tender breast, swelling, tiredness, irritability, and changes in mood.] They can interfere in normal life, so 20 to 30% of women are eligible as premenstrual syndrome. In 3 to 8%, the symptoms are serious.
The shortage of periods, which is known as amenorrhoea, when periods are not until the age of 15 or are not in 90 days. Other problems with the menstrual cycle include painful periods and abnormal bleeding such as bleeding or heavy bleeding between periods. Menstruation is in primes (apes and monkeys) in other animals.
The menstrual cycle occurs due to hormonal growth and fall. As a result of this cycle the thickening of the uterine lining, and the growth of one egg (which is necessary for pregnancy). The egg is released from the ovary around fourteen of the day in the cycle; The thick layer of the uterus provides nutrients to the embryo after implantation. If pregnancy is not there, the lining is known as the menstrual cycle.