How frequently should you change your underwear? Doctors share a clear hygiene guideline
Underwear sits closest to the skin and plays a large part in personal hygiene. How often you should change it affects comfort and health, and medical guidance clarifies best practice.
Why change every day
Most medical professionals and pharmacies advise changing your underwear every day. The crotch is warm and damp, which is a favourable environment for microbes. Underwear soaks up sweat, skin flakes and bacteria and can also trap urine residues, faeces residues and vaginal discharge, which may stay in contact with the skin for hours. Changing daily helps reduce unpleasant odours, skin irritation, fungal and bacterial infections, and itching.
When to change more often
There are times when you should change more often. After exercise such as jogging, gym sessions or hard physical work, change straight away to avoid a warm, moist environment that encourages fungi and bacteria. The same applies if you wear very tight sports leggings or technical underwear (moisture-wicking sports fabrics), or if you have a history of skin irritation or infections.
People with sensitive skin conditions such as atopic dermatitis and psoriasis should be particularly careful, because staying in the same underwear too long can upset the skin’s natural flora. Specific infections, for example pinworms, also require daily changes and washing at 60 °C to stop eggs spreading around the household.
What people in Germany are doing
A survey by the market research institute GfK, covering 1,500 people in Germany, shows that 84% of respondents change their underwear every day. Among women, 86.9% change daily, while only 73.9% of men do so. About one in four men sometimes wear underwear for more than 24 hours. Being generally healthy and washing regularly does not necessarily cause immediate illness from longer wear, but daily changes are still recommended as best practice for hygiene.
Washing and choosing the right fabrics
How you wash your underwear matters. A wash at 40 °C is adequate for many healthy people using full or good colour detergents. A wash at 60 °C is recommended for cotton underwear and in cases of infection or parasites. Delicate items need a gentler approach: 30-40 °C combined with a hygiene rinse is a better option. Using a tumble dryer can kill extra microbes, though it may make fabrics wear out faster.
Fabric choice is important: cotton and other breathable materials let air circulate, whereas synthetic fabrics trap moisture and can irritate the skin. Fit matters as well: very tight garments can cause micro-injuries that raise the risk of infection.
Different needs by gender and age
Gender and age affect underwear hygiene. Women often notice the effects of poor hygiene sooner because of natural vaginal discharge and a generally more sensitive area. Mild, breathable cotton underwear is advised to help prevent infections. Men should avoid wearing tight boxers or briefs for long periods to reduce groin irritation and should choose breathable materials for daily wear. Children, who are more prone to accidents, need encouragement to keep up daily habits so they form lasting, healthy routines.
Changing underwear is a small, low-effort habit that helps maintain intimate health. After exercise or illness, prioritise a fresh pair. Paying attention to fabric, fit and proper washing provides effective protection and comfort for everyone.