It sounds like a basic hygiene rule—but doctors say a surprising number of adults aren’t following it.
Health experts are now raising concerns about a growing habit: wearing the same underwear for more than a day. While it may seem harmless—especially if you “didn’t sweat much”—medical professionals warn that what builds up in fabric over time can increase the risk of irritation, infections, and lingering skin issues.
And the trend appears to be most common among younger adults.
What Lingers in Underwear After a Day of Wear
Studies show that underwear can accumulate bacteria quickly—even within a single day. Heat, moisture, and friction create an environment where microbes thrive, particularly in areas with limited airflow.
Doctors say that extending wear time allows bacteria and yeast to multiply, which may increase the likelihood of discomfort and skin problems.
In short: clean underwear matters more than many people realize.
Younger Adults Are Skipping Daily Changes
Recent surveys suggest that daily underwear changes are no longer universal.
According to polling data:
More than one-third of adults ages 18–24 admit to wearing the same underwear longer than 24 hours
Nearly one in four adults ages 25–34 report repeating underwear regularly
Adults over 55 were far more consistent, with most reporting daily changes
Experts say lifestyle shifts—such as remote work, long hours at home, and casual routines—may be contributing to relaxed hygiene habits.
Doctors Say Skin Problems Can Follow
Dermatologists warn that re-wearing underwear can irritate the skin and worsen existing conditions.
“Trapped moisture and friction can lead to rashes and irritation, especially for people with sensitive skin,” says Sarah Roberts, a licensed skincare specialist. “It may also aggravate conditions like eczema or psoriasis.”
The groin area is particularly vulnerable because it stays warm and experiences frequent movement throughout the day.
Yeast and Bacterial Imbalances Are a Concern
Health professionals also point to an increased risk of yeast and bacterial overgrowth when underwear isn’t changed regularly.
“Moist environments allow bacteria and yeast to multiply more easily,” explains Dr. Archit Aggarwal, a dermatologist. “This can lead to irritation and imbalance, especially in areas with skin folds.”
While women may be more prone due to anatomy, experts stress that men are also at risk.
Men Aren’t Immune—Even With Loose Underwear
For men, one common issue linked to extended wear is jock itch, a fungal skin infection that causes redness and itching in the groin area.
Some assume looser underwear offers protection—but doctors say repeated wear still allows bacteria and fungi to build up.
“Fabric type matters less than cleanliness,” Roberts notes. “Even breathable underwear should be changed daily.”
How Often Should You Really Change Your Underwear?
Medical experts agree on a simple guideline:
At least once every 24 hours.
In some cases, changing more often is recommended.
“If you exercise, sweat heavily, or live in a hot or humid climate, changing underwear more than once a day can help prevent irritation,” says Dr. Hannah Kopelman, a New Jersey–based dermatologist.
Doctors also recommend changing immediately if you notice:
Persistent itching
Redness or chafing
Unusual odor or discomfort
Early attention can prevent minor irritation from turning into a bigger issue.
The Takeaway
Wearing clean underwear every day may not feel like a big deal—but doctors say it’s one of the easiest ways to protect skin health and avoid unnecessary discomfort.
It’s a small habit that makes a meaningful difference—and one experts say is worth taking seriously.
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