We have all considered rewearing a pair of underwear to avoid laundry, but doing so can carry hidden health consequences. Throughout the day, fabric collects sweat, dead skin cells, natural oils, and bacteria. Wearing them a second day reintroduces this microscopic debris directly back to your most sensitive areas.

Regularly rewearing underwear creates a breeding ground for bacterial infections, yeast overgrowth, and skin irritation like rashes or breakouts. Because of their anatomy, women face a higher risk of developing UTIs and yeast infections, while men are more prone to jock itch and chafing.

The fabric type also plays a major role in your hygiene. Natural, breathable cotton allows proper airflow and significantly reduces your risk of irritation. On the other hand, synthetic materials like polyester or nylon trap heat and moisture, quickly turning the fabric into a petri dish for bacteria.

While you might get away with rewearing a pair if you stayed home and didn’t sweat, it should never become a habit. For the best health and confidence, experts recommend changing your underwear daily and even sleeping without them to let your skin breathe overnight.