How frequently should you change your underwear? Doctors share a clear hygiene guideline
Underwear is often overlooked, but it has an important role in keeping us healthy and hygienic. As the garment closest to the skin, it absorbs sweat, skin flakes and bacteria, and acts as a barrier to protect outer clothes. Given that intimate role, a simple question arises: how often should we change our underwear to keep intimate areas healthy?
Why you should change them every day
Medical professionals and pharmacists, including those from “Apotheken Umschau” (a German pharmacy magazine), advise changing underwear every day. The crotch area is warm and moist, which creates a favourable environment for germs. Over the course of a day, underwear picks up sweat, skin flakes, bacteria and possibly traces of urine, faeces or discharge. Wearing the same pair for two or three days can turn into what can only be described as a “germ party”.
Not following this advice carries several risks. People can experience unpleasant odours, irritation of sensitive skin, fungal infections, bacterial infections, itching and small inflammations. Changing daily is therefore a simple preventive measure against these problems.
When you should change more often
There are times when you should be stricter. After sport or any activity that causes heavy sweating, changing underwear is non‑negotiable. Sweat‑soaked underwear from exercise creates a microclimate that encourages bacteria and fungi if left on, so change immediately after such activities.
People with sensitive skin or conditions like neurodermatitis, psoriasis or recurrent infections should be especially careful. Wearing the same pair for more than a day can disturb the delicate skin flora (the skin’s microbial balance). It is better to err on the side of caution and change more frequently when needed.
In cases of specific infections or parasites, such as pinworms (Enterobius vermicularis), even tougher measures are required. For these, the AOK (a German health insurer) suggests daily changes and washing at 60°C to avoid re‑infestation or spread.
What the surveys say and common myths
A GfK survey of 1,500 people in Germany found that 84% change their underwear daily. There’s a gender gap: 73.9% of men do so, compared with 86.9% of women. Surprisingly, some still believe airing underwear overnight will do the trick. While airing can help with outer garments like T‑shirts, for underwear drying out moisture isn’t the same as a proper clean. Germs can remain in dried fibres, so washing is the only reliable solution.
How to wash them and which fabrics to pick
For healthy people, washing at 40°C with a universal detergent is usually enough. That said, 60°C is recommended for cotton garments, especially when hygiene is a concern. It’s important to dry clothes thoroughly to remove any remaining moisture, which can harbour germs.
If you have sensitive skin or an infection, choose natural, breathable fabrics like cotton and avoid overly tight underwear to reduce irritation and the risk of infection.
There are also slight differences in habits and needs across groups. Women may find breathable cotton helpful to prevent infections and odours, while men should watch material and fit to avoid groin irritation. For children, a daily change helps build good hygienic habits from an early age.
Making a point of changing and washing underwear daily is a small effort compared with the skin problems it can prevent. Folding these practices into your routine keeps you comfortable and healthy and shows the practical benefit of a simple daily garment change.