Since diabetic symptoms include neuropathy, especially in the feet and legs, and since diabetes is such a common disease, all the hits were diabetes education sites. They are practical and use simple language, e.g. This lack of feeling is caused by nerve damage, also called diabetic neuropathy (noo-ROP-uh-thee). They explain that nerves tell your sweat glands when to sweat. Sweat helps keep our skin moist and soft.
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So my left foot isn't sweating. Which I find slightly creepy.