How frequently should you change your underwear? Doctors share a clear hygiene guideline
Underwear is usually out of sight, but it is an important garment for everyday hygiene. It’s the layer closest to the skin and helps keep outer clothes clean. It soaks up sweat, catches shed skin, and can hold bacteria. A common question is: how often should you change your underwear to look after intimate health?
Make daily hygiene a habit
Pharmacists and guides like “Apotheken Umschau” (a German pharmacy magazine) advise changing underwear once a day as part of a healthy routine. The reason is straightforward: the warm, damp area around the crotch is favourable for microbes. Underwear traps sweat and skin flakes, and can also hold residues of urine, faeces or discharge against the skin for a long time. Wearing the same pair for more than a day can cause unpleasant odours and raises the risk of irritation, fungal or bacterial infections, and minor inflammations.
Change underwear daily because it reduces the risk of odour, irritation and infection.
When to change more often
Some situations call for extra care, especially after exercise or heavy sweating. If you go jogging or use the gym, sweat-soaked fabric creates a suitable environment for fungi and bacteria. It is best to put on fresh underwear straight after working out, especially if you wear tight sports leggings or if you are prone to skin irritation or have had fungal infections.
People with sensitive skin, for example those with atopic dermatitis (neurodermatitis) or psoriasis, or those who often get urinary tract or vaginal infections should be more strict. For certain conditions like pinworm infections, getting advice from health insurers such as AOK (a German health insurer) is recommended; in these cases you should change underwear daily and wash it at higher temperatures to lower the risk of reinfection.
What Germans do: survey results
A study by GfK (a market research institute), of 1,500 people, found that 84% of Germans say they change their underwear every day. Men and women differ somewhat: 73.9% of men follow this routine compared with 86.9% of women. Most people stick to good habits. The general advice is the same: fresh underwear daily is the safest approach, although wearing it a bit longer will not usually make a generally healthy person ill immediately.
Some people assume underwear can be aired overnight and worn again the next day, a trick that might work for outer garments, but not underwear. Even when moisture dries, bacteria and residues remain. The fabric may look fresh, but hygienically it’s still used.
How to wash your underwear
Changing underwear daily is only part of the story; how you wash it matters too. For everyday use, a 40°C wash with a good detergent is generally enough. If you have an infection, wash at 60°C. For delicate fabrics, a 30,40°C wash with a sanitising additive can keep them hygienically clean without damaging them. Proper drying (airing or using a tumble dryer) also helps remove germs.
Material and fit matter as well. Breathable fabrics like cotton are usually better than synthetics, which can trap moisture and irritate the skin. Well-fitting underwear that isn’t too tight helps avoid rubbing and irritation.
Changing underwear daily reduces the risk of irritation and infection. Wash items after exercise or when dealing with an illness to help keep intimate areas healthy.