The periodic discharge of blood and endometrial tissue (mucosal lining of the uterus) from the vagina is referred to as menstruation or menses or periods. Menstruation usually starts at the age of puberty (between 11 to 14 years of age), the process known as menarche and stops at menopause (around the age of 50 years). A female body is prepared in anticipation of pregnancy every month. However, if no pregnancy happens, then the lining of the uterus is shed, which is discharged in the form of menses. Menstruation also stops during pregnancy and in some females during breastfeeding. Menses can last for around 3 to 5 days. Menstrual cycle can range from 21 to 35 days and on an average it lasts for 28 days, starting from the first day of the menstruation. Females may also experience symptoms of cramping of pelvic region or abdomen, pain in the lower back, bloating and soreness of breast, carving for food, irritability and mood swings and headache and fatigue during menstruation.