A study identifies the alterations in the menstruation of Spanish women derived from the Covid-19 vaccines

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The 78% of the more than 14,000 Spanish women included in a study of University of Granada (UGR) have experienced mild changes in premenstrual and menstrual symptoms after receiving the Covid-19 vaccine. The EVA projectwhich began with the impulse of three health companies a little over a year ago, has identified what these changes are and to what extent they have affected women.

78% of more than 14,000 Spanish women studied experienced slight changes in premenstrual and menstrual symptoms after the Covid-19 vaccine

The conclusions of the study indicate that the women who have reported alterations are somewhat older, especially they are over 35 years of age, and the proportion of smokers is slightly higher. The most prevalent alterations in premenstrual symptoms are increased tiredness (43%), bloating (37%), irritability (29%), sadness (28%) and headache (28%). The most frequent changes in menstrual symptoms are increased amount of bleeding (43%), pain (41%), delayed menstruation (38%) and fewer days of bleeding (34.5%).

It is the first study in the Spanish population that collects the perceived changes in both premenstrual and menstrual symptoms derived from the Covid-19 vaccine. “Vaccinated women perceive slight alterations at both moments of the cycle. More studies are needed to describe the physiological mechanisms that explain these alterations.«argues Laura Baena.

43% had more bleeding and 41% more pain, while 38% had delayed menstruation after receiving the Covid-19 vaccine

The study launched a virtual survey for Spanish women who have received the complete vaccination schedule. Sociodemographic and clinical data have been collected. From the type of vaccine administered to the perceived changes in relation to the length of the cycle, such as the amount of bleeding, pain, presence of clots and premenstrual symptoms. Almost 23,000 Spanish women have participated in the survey. But there have been 14,153 that met the inclusion criteria of the research and on which conclusions have been drawn.

As the researchers recall, the clinical trials of the Covid-19 vaccines did not include the registration of possible changes in menstruation. “After the launch of the vaccination campaign, many women detected changes in their menstrual cycle. For this reason, the EVA project was launched, whose objective is to determine if there is an association between the vaccine against the SARS-CoV-2 virus and menstrual disorders”Baena details.

“Further studies are needed to describe the physiological mechanisms that explain these alterations”

Precisely on July 15, the magazine Sciences Advances published a study over 35,000 premenopausal and postmenopausal women which offered an assessment of the menstrual changes they experienced in the first two weeks after receiving the Covid-19 vaccine.

The work reveals that the 42.1% of menstruating respondents reported heavier menstrual flow after receiving the Covid-19 vaccine. Some experienced it within the first seven days, but many others saw changes eight to 14 days after vaccination.

About the same proportion, 43.6%, reported that their menstrual flow had not changed after vaccination. A smaller percentage, 14.3%, experienced a mixture of no change or lighter flow, the researchers report.

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