If your underwear leaves deep marks, causes chafing, or makes the area unusually hot and sweaty, trying a different size or style may help.
What About Sleeping in Underwear?
There isn't a universal requirement to sleep without underwear.
Some people prefer it.
Others find underwear more comfortable.
For most people, the more important considerations are cleanliness, comfort, and moisture.
If you sleep in underwear, wearing a clean pair at night is a reasonable choice.
If you prefer sleeping without underwear and feel comfortable doing so, that's also generally fine.
What If You Have Heavy Discharge?
For people who experience more vaginal discharge than usual, changing underwear more frequently can improve comfort.
Normal vaginal discharge varies throughout the menstrual cycle.
It can change in:
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Amount
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Texture
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Color
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Moisture
However, a significant change accompanied by strong odor, itching, burning, pelvic pain, or unusual color should not automatically be blamed on underwear.
Those symptoms can indicate an infection or another condition that needs medical attention.
What If You Sweat a Lot?
If you are someone who sweats heavily, once-a-day underwear changes may not be enough for comfort.
You may want to change after:
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Exercise
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Sports
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Long periods outdoors
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Hot-weather work
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Swimming
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Heavy sweating
The goal isn't to follow an arbitrary schedule.
The goal is to avoid sitting in damp fabric for extended periods.
What About Periods?
During menstruation, underwear may come into contact with menstrual blood.
If that happens, it's best to change the underwear rather than wearing the same pair again.
Menstrual blood itself isn't inherently "dirty," but prolonged contact with blood and moisture can cause discomfort, odor, and staining.
Changing underwear when it becomes soiled is simply good hygiene.
How Should Underwear Be Washed?
Changing underwear is only half the equation.
Proper washing matters too.
In general:
Follow the garment's care label
Different fabrics require different washing conditions.
Use an appropriate detergent
You don't need an aggressive chemical product simply because you're washing underwear.
Wash thoroughly
Make sure detergent and water can adequately clean the fabric.
Dry completely
Avoid putting on underwear that remains damp.
Moisture left in fabric can contribute to odor and discomfort.