Women navigate a lifetime of physical challenges—from menstrual cramps and endometriosis to childbirth—often maintaining remarkable composure. In contrast, men may grimace at the slightest cold, evoking dramatic imagery. Yet, science validates their discomfort: during the flu, men truly experience more intense symptoms than women.
On Wednesday, January 15, 2020, Santé Publique France announced the flu epidemic's official start in Ile-de-France and Provence-Alpes-Côte d'Azur, with other mainland regions in pre-epidemic phase. Be patient with the men in your life if they fall ill. A 2016 study in the American Journal of Physiology conclusively showed women suffer less from influenza, thanks to estrogen—our key sex hormone.
Here's how it works: The flu virus infects cells, replicates, and spreads. Estrogen provides women with antiviral protection by curbing viral replication, reducing infection severity. Women still get sick, but symptoms hit less hard than in men.
Researchers tested this using nasal cells—prime flu virus habitat—from both sexes. They sensitized cells to estrogen with chemical compounds, then exposed them to the virus. Female cells resisted better, showing significantly lower viral loads even after estrogen treatment compared to male cells. A clear win for female biology.
Estrogen in oral contraceptives may help against seasonal flu. However, study co-author Sabra Klein cautions: "You can still catch the flu, especially if unvaccinated. Estrogen levels fluctuate cyclically in premenopausal women, making broad protective effects hard to observe population-wide." No one is fully immune—vaccination remains essential.
