The US research, published in Science Advances, is an exploratory study and cannot establish a cause. Since vaccine trial protocols do not usually follow up on menstruation, Covid vaccine manufacturers have been unable to address reports of unexpected bleeding after getting a jab. The authors write that such short-term changes to bleeding are normally not uncommon or dangerous, and emphasise that changes of this nature are generally not indicative of changes to fertility. However, they call for these experiences to be studied more in order to build people’s trust in medicine.
This is a companion discussion topic for the original entry at https://www.sciencemediacentre.co.nz/2022/07/16/covid-jabs-and-menstrual-changes-expert-reaction/