Menstrual cycle The first period usually begins between twelve and fifteen years of age, a point in time known as menarche. They may occasionally start as early as eight, and this onset may still be normal. The average age of the first period is generally later in the developing world and earlier in developed world. The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women and 21 to 35 days in adults (an average of 28 days). Menstruation stops occurring after menopause which usually occurs
Menstrual cup capable of growing on menstrual cups. However, there have only been two confirmed cases of toxic shock syndrome (TSS) associated with the use of the menstrual cups. The first case was a woman who had a history of Hashimoto’s thyroiditis and chronic menorrhagia. In the second case, the menstrual cup had been left in for 7 days. Menstrual cups are generally bell-shaped, with a few exceptions. Most brands use medical grade silicone as the material for the menstrual cup, although latex and thermoplastic elastomer are also options. Menstrual cups made from silicone are generally designed to last for 1–5 years.