It sounds like the most basic hygiene advice imaginable: change your underwear every day.
Yet surveys suggest that many people quietly stretch that rule — sometimes by a day, sometimes longer. Health experts say that seemingly harmless habit could create the perfect environment for irritation, infection, and lingering skin problems.
What’s Really Building Up?
Underwear sits against some of the warmest, most moisture-prone areas of the body. Throughout the day, sweat, natural oils, dead skin cells, and trace amounts of fecal bacteria accumulate in the fabric.
A frequently cited 2021 hygiene analysis estimated that the average worn pair of underwear may contain about 0.1 grams of fecal residue — a small amount, but enough to introduce bacteria like E. coli to sensitive skin.
When the same pair is worn beyond 24 hours, moisture and microbes continue to multiply. Add friction from movement, and the skin barrier can become compromised, increasing susceptibility to rashes or infections.
Who’s Skipping the Swap?
Polling suggests younger adults are more likely to re-wear underwear. A 2023 survey reported by Newsweek found:
36% of Gen Z respondents (18–24) said they wear the same underwear for more than 24 hours.
14% admitted doing so regularly.
Among millennials, 24% reported frequently repeating pairs.
By contrast, older adults were less likely to stretch wear time, with a majority reporting they change daily without exception.
Why It Matters for Skin Health
Dermatologists warn that extended wear can trap heat and moisture — ideal conditions for bacteria and yeast to thrive.
For women, the vulvar area contains folds that retain moisture more easily, increasing the risk of yeast infections or bacterial vaginosis. Symptoms may include itching, burning, unusual discharge, or odor.
For men, fungal infections such as jock itch can develop in the groin, inner thighs, or buttocks. Even loose-fitting boxers don’t eliminate risk if they’re not changed regularly.
People with eczema, psoriasis, or sensitive skin may be especially vulnerable. Repeated friction combined with microbial buildup can aggravate flare-ups and delay healing.
When Once a Day Isn’t Enough
Most health professionals recommend changing underwear at least every 24 hours. However, certain situations call for more frequent changes:
Intense workouts
Heavy sweating
Hot or humid climates
After swimming
During illness
If you notice itching, redness, unusual discharge, or persistent discomfort, it’s a signal that something isn’t right. Changing into clean, breathable cotton underwear is a simple first step — and persistent symptoms should be evaluated by a healthcare provider.
The Bigger Picture
Re-wearing underwear for an extra day might not cause immediate harm for everyone. But consistently ignoring basic hygiene can gradually increase the risk of skin breakdown and infection — especially in moisture-prone areas.
Small daily habits often have outsized effects on long-term health. Clean underwear is one of the simplest preventive measures available: inexpensive, low effort, and highly protective.
Conclusion / Call to Action
Changing your underwear daily isn’t just about freshness — it’s about safeguarding your skin’s natural defenses. A clean pair every 24 hours (or more often when needed) helps reduce bacterial buildup, limit moisture retention, and prevent avoidable infections.
If it’s a habit you’ve been stretching, consider this your reminder: sometimes the smallest routines make the biggest difference.