You should change your underwear at least once a day, and more often if it gets sweaty, damp, or soiled (after a workout, a hot day, or discharge/periods).

Quick Scoop

  • Change underwear at least once every 24 hours to reduce irritation, odor, and bacterial or yeast infections.
  • Change immediately after:
    • Exercise or sports
    • Getting very sweaty or overheated
    • Swimming
    • Any leak, discharge, or period overflow.
  • Aim for breathable fabrics like cotton , which help keep the area dry and lower infection risk.

“Fresh underwear daily is the golden rule. If you sweat, exercise or are on your period, change more often to avoid yeast and bacterial infections.”

Daily vs. “More Than Once”

Think of it like this: once a day is the baseline, and your body’s activity tells you when to go beyond that.

  • Once a day is non‑negotiable
    • Most dermatologists and gynecologists say: one clean pair every day to cut down bacterial growth and irritation.
* Wearing the same pair multiple days in a row raises the risk of odor, rashes, and infections.
  • Twice (or more) a day makes sense if :
    • You have a very active job or commute in hot weather.
* You’re on your period and using pads, or experience a lot of discharge.

* You have sensitive skin that reacts quickly to moisture or friction.

A simple rule of thumb: if your underwear feels damp, sticky, or smells off, change it—don’t wait for the “24‑hour mark.”

What About Replacing Old Underwear?

This is different from changing daily—this is about when to throw old pairs away. Many clothing and underwear brands suggest:

  • Replace underwear roughly every 6–12 months , depending on how often you wear and wash each pair.
  • They may wear out faster (closer to 6–9 months) if:
    • You have a small rotation and wash the same pairs constantly.
* The elastic is stretched or the fabric is thinning.

Key signs it’s time to retire a pair:

  • Loss of elasticity (waistband or leg holes sagging).
  • Persistent odor even after washing.
  • Stains, holes, or rough fabric that irritates the skin.

You don’t need to follow internet “rules” like “all underwear expires in exactly six months,” but you should listen to comfort, cleanliness, and condition.

Mini FAQ (Forum‑Style)

Q: Is it really that bad if I wear the same pair for two days?
A: Many people admit they do this, but experts strongly advise against it because it increases irritation and infection risk, especially in warm, moist areas.

Q: How many pairs should I own?
A: Some hygiene guides suggest having at least 7–10 pairs so you can rotate and always have a clean one for each day of the week.

Q: Do certain fabrics matter?
A: Yes. Cotton is usually recommended as the safest everyday choice because it’s breathable and helps prevent moisture buildup and irritation.

Q: Do I have to wear underwear at night?
A: No. Some experts say going without at night can improve airflow and reduce moisture, especially if you’re prone to irritation.

Simple Takeaway

  • Change : At least once daily, more often if sweaty, damp, or dirty.
  • Replace : Around every 6–12 months, or sooner if stretched, smelly, or uncomfortable.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.