Which part of the human body contains the most sweat glands?

Eccrine glands are the main sweat glands responsible for cooling you down when you get too hot. They make sweat and send it to your skin's surface, where it evaporates to disperse heat and lower your body temperature. Common conditions affecting these glands include hyperhidrosis (sweating too much) and anhidrosis (not sweating enough).

Eccrine glands are located in your skin, and are spread out all across your body. Some eccrine glands are in dense clusters, while others are farther apart. They're most tightly packed together on the palms of your hands and the soles of your feet. In these areas, you have anywhere from 250 to 500 glands per square centimeter (smaller than a postage stamp).