An estimated 3 percent of the U.S. population — some 8 million people — suffer from what's known as plantar hyperhidrosis, or excessive foot sweating, according to the American Podiatric Medical Association. This type of sweaty feet is not caused by the normal causes of sweating, such as high heat or exercise, but rather it's an all-the-time issue that occurs without a culprit. This condition can be both emotionally and physically debilitating, says Dan Michaels, DPM.
"While no one knows what causes this condition, it seems to be inherited and can affect palms, soles, armpit, hair, legs, and back," Dr. Michaels says. "When affecting the foot, it can increase foot odor and can cause an increased risk of infections — including fungal toenails." One easy remedy is to ensure that you're purchasing the proper socks — ones that are breathable and both moisture-absorbing and moisture-wicking, Dr. Michaels says. If your socks aren't made with the right materials and structure, they can exacerbate sweating and even lead to blisters, he warns.