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One Pair Per Day May Not Be Enough for Everyone
Daily changing is a useful baseline rather than an absolute maximum.
Someone who works a desk job in a cool room may remain comfortable in one pair throughout the day.
A person who spends several hours exercising outdoors in summer may reasonably need another pair.
The practical rule is simple.
If underwear becomes noticeably damp, heavily sweaty or soiled, change it.
You do not need to wait until the next morning.
Sleeping Habits Are Largely About Comfort
There is no universal requirement that everyone must wear underwear while sleeping.
Some people prefer loose sleepwear or sleeping without underwear because it feels cooler and reduces moisture.
Others are perfectly comfortable sleeping in clean, breathable underwear.
The most important considerations are comfort, cleanliness and avoiding clothing that keeps the area excessively hot or damp.
Do You Need to Wash Underwear in Very Hot Water?
Not necessarily.
The idea that every pair of underwear must always be washed at the hottest possible temperature is too simplistic.
Follow the garment’s care instructions and use an appropriate laundry detergent.
What matters most for routine use is that the underwear is properly washed and completely dried before being worn again.
Excessively hot washing can also damage certain elastic fibers and fabrics.
Make Sure Laundry Detergent Is Not the Real Problem
If itching continues even though underwear is clean and dry, the laundry products themselves may deserve attention.
Fragrances and other ingredients can irritate sensitive skin in some people.
Incomplete rinsing can also leave detergent residue behind.
Switching to a gentler fragrance-free product may be useful for someone who suspects skin sensitivity.
Persistent irritation, however, should be assessed rather than treated indefinitely through trial and error.
Do Not Share Underwear
Underwear is a personal item and should not be shared.
The same principle applies to towels and other items that may remain in contact with affected skin when someone has a contagious fungal infection.
Ringworm can spread through contact with infected people as well as contaminated objects and surfaces.
Keeping personal items separate can therefore be particularly important when someone in the household has a known fungal infection.