The human foot has over 250,000 sweat glands and can perspire as much, or more, than any other body part. The foot can actually produce up to a pint of sweat in one day. Sweat is the most common reason that a foot may have a distinct odor, and while the sweat itself is not the culprit, it harbors the bacteria that cause the stench.
Causes of Odor
Along with sweat, several other potential culprits can cause foot odor, such as high anxiety, medications, hormones or even a particular skin condition. If it is extremely foul smelling, it may be due to a condition known as bromhidrosis. If the condition is limited to smell alone, most cases do not warrant a visit to a podiatrist, but if the odor is accompanied by red or scaly skin, you may have a bacterial or fungal infection. Contact your doctor as soon as possible.
Bacteria
Bacteria are a major cause of foot odor. Also known as brevibacteria, they grow abundantly in dark, damp places such as in shoes, socks and between toes. The creation of sulfur compounds by this bacteria is what causes the smell. Feet with hair may have added odor intensity due to the increased surface area, as well as the reduced "breathing" room.
Shoes
To help combat sweaty feet, shoe purchases should be considered. Shoes made of leather will allow your feet to breathe and release moisture. Inexpensive, plastic and "pleather" shoes, though, can cultivate odors because the shoe will actually absorb the scent. Consider wearing a different pair of shoes each day, allowing at least one day between wear, so that each pair can dry out. Shoes can also be sprayed with an antibacterial spray or powder to further rid them of the bacteria within. Washing shoes in the washing machine can also help kill any bacteria that still linger, but be certain to dry thoroughly before re-wearing.
Socks
Socks should be considered prior to wear, for they too can help cause foot odor. Cotton and wool best help to absorb sweat and moisture. Thickness can also account for odor problems as the sock may be too thin. Be sure to wash socks between use, as used pairs can hold moisture and bacteria until washed. If the smell continues to persist, consider changing socks frequently throughout the day, as needed.
Prevention
Other measures can also be taken to prevent foot odor. Washing feet regularly with antibacterial soap and using a foot file or pumice stone to remove dead skin can help reduce odor. Be sure to dry feet thoroughly. The use of a foot powder, regularly, can aid in preventing foot odor. Before applying the powder, be sure your feet are dry, as sweat can reduce powder's effectiveness. Inserts such as charcoal or cedar can absorb odor left in shoes. If foot odor continues, a doctor may be able to provide a prescription anti-sweat medication that is applied topically to the area.
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