\[ **BT: [[human beings#reproduction]]** ] --- # menstrual cycle ## menstruation [[Humans and chimpanzees bleed more during menstruation because of the large size of their uteri in relation to body size.]][^1] ### menstruation products [[In China, tampons and menstrual cups are not commonly used. They will not be available at regular outlets. Stores such as Watson’s or Auchan are your best bet.]][^2] --- ### PMS (and PMDD) [[PMS and PMDD tend to be more common (and worse) in women with ADHD.]][^3] - see also: [[ADHD]] --- ## historical beliefs about menstruation [[There was a belief that menstruation typically lasted seven days.|In his 1816 text, Thomas Taylor wrote that menstruation typically lasts seven days.]][^4] [^1]: Beverly I. Strassman, ‘[[Strassman, ‘The Evolution of Endometrial Cycles and Menstruation’, 1996|The Evolution of Endometrial Cycles and Menstruation]]’, *The Quarterly Review of Biology*, vol. 71, no. 2 (1996), p. 181, https://doi.org/10.1086/419369. [^2]: Zhang Jieran, ‘[[Zhang, ‘Contraceptive Pills in China’, 2025|Contraceptive Pills in China: Types, Prices, and How to Buy Safely]]’, Chixporation.Com, 23 September 2025, [https://chixploration.com/contraceptive-pills-in-china-types-prices-and-how-to-buy-safely/](https://chixploration.com/contraceptive-pills-in-china-types-prices-and-how-to-buy-safely/). [^3]: Linda Roggli, ‘[[Roggli, ‘ADHD at the Center’, 2023|ADHD at the Center: A Whole-Life, Whole-Person Condition]]’, *ADDitude Magazine*, updated 12 December 2023, https://www.additudemag.com/areas-of-life-health-relationships-career-adhd/. [^4]: Thomas Taylor, *[[Taylor, Theoretic Arithmetic of the Pythagoreans, 1816|The Theoretic Arithmetic of the Pythagoreans]]* (London: J. Valpy, 1816; Samuel Weiser, 1972), p. 229. citations refer to the 1972 edition.