Sweat can indicate a lot of things: you've just run a marathon, you're overheated in a sauna, you're nervous at a job interview. But if you're not sweating bullets, you probably aren't paying *tons* of attention to your normal, everyday sweat. What you probably don't realize is that sweat can tell you a lot of things about your health, from underlying issues to metrics about your overall wellness.
Sweat isn't just water, of course; it contains minute quantities of a lot of things, including urea and trace amounts of various metals, and everything from how we sweat to what we sweat can give us indications about our overall health. Wearables are starting to be able to track sweat and its components, and analyze what that says about your health; in the future, elite athletes and hospital patients alike might be fitted with wearable patches that analyze the composition of their sweat and help doctors and trainers draw conclusions from it. But for now, though, the tech is a little bit more low-fi; checking out your sweat, how it smells, and using that info to stay in-tune with your body. Here are a few things that your sweat can tell you about your health.