According to WebMD, a girl's uterus produces a new lining in preparation for possible conception each month. If no egg is fertilized during a cycle, the lining of the uterus is shaded. This shedding of the uterus accounts for the monthly bleeding we call a girl's monthly period.
Hormones are solely in charge of the menstrual circle, mostly progesterone and estrogen. Progesterone is in charge of the shedding of the uterine lining built by estrogen. These hormones that play important roles during a woman's monthly cycle can equally lead to several other symptoms other than bleeding. Some girls experience things like anger or emotional tension, tender breasts, low energy levels, acne, abdominal cramps, and water weight gain before or during the monthly period. These symptoms often go away after some days.
Girls make use of pads or tampons to control their bleeding, which can sometimes last as long as seven days. To control other symptoms that come with their monthly periods, girls make use of warm bath, heating pad, and over-the-counter pain drugs like naproxen or ibuprofen.