Hormonal Changes and Periods Can Cause Herpes Outbreaks

So many of women we talked to, experience outbreaks around the time of their periods. A few days prior, or on the mark - here they come, together. A herpes outbreak and your monthly period.

If you've noticed the same thing, you're not alone. Research confirms that hormonal fluctuations throughout your menstrual cycle can directly influence herpes reactivation.* A 2022 study found that "cyclic hormonal changes associated with the menstrual cycle" are a known cause of herpes reactivation in the genital tract. Even a 2025 case report documented a woman whose ulcers recurred every month during her menstrual cycle, with hormones identified as one of the key triggers.**

Let's talk about what's actually happening, why your body does this, and what you can do about it—without feeling like you're at the mercy of your own biology.

Here's the science part, but I'll keep it simple. Your cycle has different phases, and each one brings different levels of estrogen and progesterone. These hormones don't just affect your mood and energy—they also talk to your immune system.

One study found that during the follicular phase (the first half of your cycle, leading up to ovulation), women had HSV-2 DNA detected on 20.9% of days, compared to 17.8% in the luteal phase—a significant difference. That means you may be more vulnerable to shedding and outbreaks at certain points in your cycle, even if you feel fine.

The time around menstruation itself has long been recognized as a window of increased susceptibility to infections. Your immune system shifts, and for some of us, that shift is enough to let the herpes virus wake up from its dormant state.

And while we're at hormones. Whatever hormonal changes you're experiencing, it could be a cause for outbreaks. We've heard women say when they started or stopped taking the contraceptive (of any sort), when they're pregnant, etc. List goes on. Whatever changes your body is going through, it needs adjusting. Give it some time, and it will come around.

So what actually helps? Here's what I've learned works for me and for many others in the Secret Society.

First, be extra gentle with yourself during that window. Your immune system is already doing double duty. Don't add stress, poor sleep, or crappy food to the mix if you can avoid it. Think of it as giving your body a little extra support when it needs it most.

Second, consider immune-supporting supplements, especially in the days leading up to your predicted outbreak window. Lysine, monolaurin, and vitamin C are popular options. But the one that also makes a huge difference for me is Andrographis.

Third, if that's your thing, consider antivirals. Some women decide to take them a few days prior, and it calms down the upcoming outbreak, so they don't need to deal with it.

I mentioned Andrographis in a previous post, and I'm bringing it up again because it's that good for hormonal outbreaks.

A 2023 study published in Scientific Reports*** confirmed that Andrographis paniculata extracts are effective against herpes simplex virus type 1 (HSV-1), showing significant antiviral activity. The plant has broad-spectrum antiviral properties. For me, taking Andrographis daily—and bumping up my dose around my period—has made a noticeable difference in both the frequency and severity of my cycle-related outbreaks.

Does it work for everyone? No. But for me, it's been a game changer.

Here's the thing about hormonal outbreaks. They're predictable. And anything predictable is something you can talk about.

If you've been dealing with monthly outbreaks and feeling like your body is working against you, I want you to hear this: You're not broken. You're not dirty. You're not doing anything wrong. You're just a person with a cycle and a virus that happens to notice when those hormones shift.

The good news is that knowledge is power. Now you know why it's happening. And knowing why means you can do something about it. Track your cycle, support your immune system, talk to your partner, and give yourself some grace.

References

*https://www.health.com/condition/herpes-simplex/living-with-herpes-i-was-ashamed-of-having-herpes-until-i-learned-how-to-treat-it

**https://academic.oup.com/humrep/article/37/Supplement_1/deac107.392/6620245

***https://www.nature.com/articles/s41598-023-46249-y?fromPaywallRec=false