The physical process begins with the at the base of the brain. Around the ages of 11 to 17, this gland sends hormones to the ovaries, signaling them to mature an egg and the uterus to build up a thickened, velvety lining of blood and fluid.
Just before or during a period, individuals may experience symptoms like . Experts recommend: Menstruation | Period - MedlinePlus playing period
: A typical cycle lasts about 28 days , with bleeding usually lasting between 3 and 7 days . The physical process begins with the at the