The fever vaccine is fortunately the most common in Spain and also indicates A basic tool for fighting the waves of this infection What Every season affects our country.
Like all drugs or vaccines, serum against fever You can have some side effects; Of course, you should always remember that the benefits violate potential risks. Now, a new study has decided that the fever vaccine, alone, and Gov -19, can change the menstrual cycle slightly and temporarily.
Reading the contradictions in the menstrual cycle
According to an article The Jama network is openOvarian Is the result Global review .
To do this, they took Data from 1501 people with the uterus From the age of 18 to 45, which does not take hormonal contraceptive drugs collected in the use of birth control. Of these, 791 received an isolated fever vaccine, and 710 were in conjunction with Gov -19.
And They took into account the recorded menstrual cycle .
Mild side effects are solved by themselves
In this way they compared it, the flu vaccine lasts, and on average, Menstrual cycle in 0.4 daysIntegrated vaccine did in 4.9 days; Due to the characteristics of the model, this difference between the two groups is not considered statistically importance.
Similarly, they found it Change during the period of eight days or more Only 4.7% of those who received an isolated fever vaccine were only 5.9% of the recipients of two Sera.
The most important increase, on average, occurs when vaccination This occurred during the follicular phase of the cycleIn the case of fever vaccine, it reaches 0.82 days and 0.99 days in double vaccines. On the contrary, those who were vaccinated during the luteel phase did not show changes in the periods of their time. In all cases, the duration of the cycle was quickly normalized.
That is, the results confirm that the flu vaccine can cause conflicts in the menstrual cycle. However, these evidence, rather than advising those who are concerned about these potential side effects, researchers warn that, rather than instrucing them to. They support Sera’s safetyThey certify that changes are mild in any case and they are resolved themselves.
Notes
Emily R. Bonniface et al. The length of the menstrual cycle changes in the length of the menstrual cycle following vaccination with the influenza or the Gov -19. Jama Network Open (2025). DOI: 10.1001/jamanetworkopen.2025.7871
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