A new Norwegian study suggests that vaginal bleeding may be a possible side effect of the covid vaccine. It found that those who took the pharmaceutical company Moderna’s “Spikevax” variant were at greater risk of bleeding compared to those injected with the Comirnaty vaccine.
A new study by the Norwegian Institute of Public Health looked at these types of bleeding in women who are no longer menstruating and who have taken the covid vaccine. The researchers gathered data from two large cohort studies, meaning that they look at a group of individuals who share a common denominator, collected by the Norwegian Institute of Public Health.
One, the senior cohort, involved women aged 66 to 81, all of whom were considered non-menstruating.
In the second, the MoBa cohort, women aged 32 to 64 were first asked if they were still menstruating and those who were still menstruating were not included in the study. Furthermore, women who were pregnant or had a hysterectomy were not included. Those who answered no or did not know if they were still menstruating were included in the study and were also considered non-menstruating.
They included 7725 postmenopausal, 7148 perimenopausal and 7052 premenopausal women who answered questions about unexpected vaginal bleeding in 2021.
Multi-fold increased risk
The study, published in the scientific journal Science Advances, found that over an eight- to nine-month period, 3,3 percent of postmenopausal women reported experiencing some kind of unusual bleeding and 14,1 percent of perimenopausal women reported the same. Among premenopausal women, the figure was 13,1 percent. About 50 percent of the reports were received within 28 days of injection.
Compared to pre-vaccination, it was found that the risk of bleeding increased two to threefold in postmenopausal women within four weeks of covid vaccination. For perimenopausal and premenopausal women, the risk was three to five times higher.
In addition, the Spikevax vaccine was associated with a 32 percent increased risk compared to Comirnaty among premenopausal women.
The researchers say the findings suggest that unexpected vaginal bleeding can occur for women as a side effect of the covid vaccine across different reproductive stages and hormone treatments.
The conclusion, according to the researchers, is that unexpected vaginal bleeding may be a side effect in both pre- and postmenopausal women after injection of the covid vaccine, while emphasizing that it needs to be confirmed with more studies and taken into account in future vaccine studies.