Over more than 100 years, fewer than 40 cases of decidual cast shedding — during which the uterus’ thick mucous lining is shed, intact — have been reported. But over a 7.5 month period in 2021, 292 women experienced it, raising questions about whether Covid-19 vaccines could be to blame.
Decidual cast shedding – clinically known as membranous dysmenorrhea – is so rare that most people have never heard of it, including most health care workers. It describes a gynaecological event during which the decidua, or the thick mucous membrane that lines the uterus, is shed in full, intact form.
The “cast” that is shed from the vagina is fleshy and red or pink in colour, typically with a triangular shape that mirrors the internal shape of the uterine cavity. Over the last 109 years, fewer than 40 cases of decidual cast shedding (“DCS”) have been reported in the medical literature Until now.
Nearly 300 Women Experienced DCS Over 7.5 Months in 2021
The MyCycleStory survey was distributed via social media from May 16, 2021, to December 31, 2021. Menstrual abnormalities have become commonplace following the rollout of Covid-19 vaccines,[iii] and the 91-question survey targeted women aged 18 and over who were experiencing menstrual anomalies. Of the 6,049 women who responded, 292, or 4.83%, reported experiencing a DCS incident during the 7.5 month data collection period.
Of this group, 96.2% also said they had experienced health problems or menstrual irregularities since January 2021 — coinciding with Covid-19 vaccines being released in the US. According to the study, which was published in The Gazette of Medical Sciences in April 2022: