NEW YORK - Some people experience headaches or sore arms after getting vaccinated. Others may have nausea or swollen lymph nodes.
The research expands on the team's earlier findings as well as anecdotal reports from people who noticed erratic periods after receiving their shots. It includes data from nearly 20,000 people around the world - 14,936 of whom were vaccinated and 4,686 who were not. It is normal to experience some level of variation in menstrual cycle. The hormones that regulate a woman's monthly cycle can be affected by a variety of factors, including stress, weight loss or weight gain, calorie restriction and intense exercise.
Individuals who received both shots in the same menstrual cycle experienced a bigger change: Their periods were, on average, almost four days late. In this subgroup, 100 people noticed a delay of eight days or more.said Dr Jennifer Kawwass, a reproductive endocrinologist at Emory University, who was not involved in the study.There is most likely some crosstalk between the immune system and other parts of the body that help protect against outside pathogens, including the reproductive system.
The fact that menstrual cycles returned to normal quickly also might help settle concerns around newer mRNA vaccine technology.
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It is not yet clear exactly how the Covid-19 vaccine prompts these changes.
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