1. Excessive Sweating (Hyperhidrosis)

Excessive sweating of the feet can create a breeding ground for bacteria, which feed on the sweat and produce a foul odor. This condition, called hyperhidrosis, can be caused by genetics, hormonal imbalances, or other health issues. To manage foot odor caused by excessive sweating, it’s important to keep feet dry and clean, use moisture-wicking socks, and apply antiperspirant or foot powders.

2. Athlete’s Foot

A musty or sour smell from the feet may be due to athlete’s foot, a fungal infection that thrives in warm, moist environments. Along with the odor, athlete’s foot typically causes redness, itching, and peeling skin between the toes. Over-the-counter antifungal creams can usually treat athlete’s foot, but severe cases may require a prescription.

3. Poor Foot Hygiene

Not washing your feet regularly, or wearing the same pair of shoes every day without allowing them to air out, can also lead to bad foot odor. Proper hygiene and allowing shoes to dry out between uses can help reduce this issue.

4. Diabetes

In some cases, a sweet or fruity odor from the feet could be a sign of diabetic ketoacidosis, a serious complication of diabetes. This condition occurs when the body cannot produce enough insulin, leading to high levels of blood sugar. If you have diabetes and notice this smell, seek medical attention immediately, as it could be life-threatening.