Aunt Flo might have met her match. 

For most women, “that time of the month” is more than just an inconvenience — it brings painful symptoms that are bad enough to keep many home from school, work and other plans just to recover.

But before you reach for the hot water bottle and pain relievers, a first-of-its-kind study suggests simply swapping your period products could significantly ease that discomfort.

Researchers followed a group of 188 women across the US over three full menstrual cycles.

The participants, whose average age was 30, all experienced menstrual cramps not linked to endometriosis (which can cause severe pain and heavy bleeding).

During the first cycle, participants used regular tampons, one of the most commonly used period products nationwide.

For their second and third cycles, they were given the option to switch to either a menstrual cup or disc made by Saalt, an Idaho-based company that produces reusable period care products.

By the end of the study, the researchers found that 78% of the women reported improvements in symptoms like cramping, headaches, fatigue, bloating and food cravings while using cups or discs compared to tampons.

The share of women reporting zero cramping jumped from 4% during the tampon cycle to 24% while using cups or discs — a six-fold increase.

There were even some unexpected perks. About 14% of participants said they bled for fewer days while using cups or discs compared to tampons.

That finding resonated with Cherie Hoeger, Saalt’s co-founder and CEO, who said she noticed similar changes after making the switch herself.

“When I first tried a menstrual cup, I remember being shocked by how comfortable it was compared to tampons,” she told The Post.

“My cramping also started to diminish, and I noticed that my periods were seemingly cut shorter, lasting only four or five days rather than the typical six days I had experienced for the prior two decades,” Hoeger continued. “I was truly blown away.”

Since launching Saalt in 2018, Hoeger said she’s heard similar stories from customers who use the company’s cups, discs and period underwear.

“This was the inspiration behind commissioning the study — we wanted to substantiate the anecdotal evidence we’d heard from customers for years with third-party data and give women research that supports an alternative to the tampon default,” Hoeger said.

While the study identified a link between cup and disc use and fewer symptoms, researchers say more work is needed to understand exactly why. Still, there are several key differences between the products that could offer clues.

“One distinct difference between cups and discs and tampons is the method of interaction, as cups and discs collect blood and tampons absorb it,” said Dr. Marybec Griffin, a sexual health researcher who worked on the study.

“There’s also the structural components of the two methods: Cups and discs are more flexible so they move with the body where tampons are more rigid and don’t have the same flexibility,” she added.

Griffin also pointed to recent research that detected metals, including arsenic and lead, in tampons from multiple brands, noting that little is known about the effects of long-term exposure.

“Currently, the FDA doesn’t require companies to list ingredients or chemicals for tampons or pads,” she said. “This means users aren’t aware of the potential health risks.”

Before the study began, only 30% of women who participated had ever tried a menstrual cup or disc. The biggest reasons for avoiding them were concerns about heavy flow and worries about mess.

Hoeger said this “ick” factor is a common hesitation among those on the fence about making the switch to reusables — but she insists that when women actually make the switch they adapt quickly.

Looking ahead, 76% of the participants said they planned to keep using cups or discs after the study ended. The remaining 24% who opted out pointed to issues like difficulty removing the products, discomfort, bladder pressure or other side effects.

Adverse events were rare but did occur: One participant reported bladder pressure, one experienced worsened cramping, two developed yeast infections or itchiness and one needed assistance removing the cup.

Researchers noted these issues may be tied to natural anatomical differences — such as a retroverted uterus or a shallow pubic shelf — which can affect how these products fit. Many women, they added, may not even know they have these variations.

Asked whether she thinks it’s better overall to use cups or discs or tampons or pads, Griffin said the jury is still out and may be different from person to person.

She noted that prior research has documented that cups reduce infection rates relative to tampons, offer longer wear times and generate a fraction of the environmental waste.

“Our research adds another layer by linking cup and disc use to reduce subjective symptom burden,” Griffin said. “Our findings are preliminary, but we believe that women should be given all of the information available to make a fully informed choice about how to manage their periods.”