Odour in the crotch and whether it is the trousers or the underwear
Short answer: When trousers smell in the crotch, it is usually down to sweat, moisture and bacteria settling in both underwear and trousers. Wash both as the label says, and let the trousers air between wears. If the smell is strong or new, talk to your doctor.
Why trousers smell in the crotch
The skin sweats, and the moisture stays in the fabric between washes. Thick trousers and tight cuts hold the heat and let little air through. If you wear the same trousers day after day without washing them, the smell builds up and grows stronger over time.
How to find the culprit
Take off the day's underwear and smell it first. If it smells, it needs changing more often or replacing. If it is neutral but the trousers smell, the problem lies in the trousers. Also try wearing different underwear with the same trousers for a day and see what changes.
The underwear as the first layer
Underwear sits closest to the skin and takes most of the moisture before it reaches the trousers. You can look at the range under bamboo underpants for men if you want to try a soft, airy fabric. Change them every day and wash them according to the care label.
What the trousers absorb
Trousers in thick cotton, wool or synthetic fabric can hold on to odour, especially in the crotch and inner thighs. If you hang them to air after wearing, the moisture has time to evaporate. Wash them more often if you sweat a lot, and check whether they tolerate a moderate temperature.
Washing that really removes odour
Do not overfill the machine, so the water can reach into the fabric. Use a suitable amount of detergent and turn the clothes inside out so the crotch properly meets the water. Dry everything completely before you put it in the wardrobe, because damp clothes quickly bring back an old smell.
Fit and air
Very tight trousers and underwear allow less air exchange and more sweating. A slightly looser cut on the trousers can make a noticeable difference during the day. Choose underwear that fits closely without pinching, so nothing rubs and skin and fabric are allowed to breathe.
Everyday habits that help
Change underwear every day, and bring a spare pair if you will be out for a long time. Let the trousers hang in fresh air overnight. A soft layer under the shirt such as a bamboo undershirt for men can make the day more comfortable, but it does not fix the smell from the trousers themselves.
When you should see a doctor
If the smell comes suddenly, is very strong, or comes with itching, redness or pain, it is not a washing problem. Talk to your doctor, who can assess the cause. Here we can only give general advice about clothing and washing, not diagnoses.
Frequently asked questions
Why do trousers smell in the crotch even though I wash them
Often the wash is too short or too cold or the machine too full, so the smell stays in the fabric. Wash according to the label with more room in the drum, and dry everything fully.
How often should I wash the trousers
It depends on the fabric and how much you sweat. Many wash after a few days of wear, but trousers that smell may need washing sooner. Always let them air between wears.
Can different underwear solve it
It might help, but it depends on cut, size and fabric. Compare bamboo T-shirts for men and underwear in the same softness, and check what feels most comfortable to you.
