Menstruation is a process of shedding blood from the uterus that usually begins for women between the age of 11 and 14 years and continues till menopause. It indicates the start of a reproductive life in women. Menstrual cycle may range from 21 to 45 days. The average length of a cycle is 28 days. At the time of menstrual period, a woman may experience abdominal cramping, lower back pain, bloating and sore breasts, mood swings, irritability, headache and fatigue. Most women will have symptoms of premenstrual syndrome (PMS), which include emotional and physical symptoms that start one or two weeks before the menstrual period.