When you start feeling achy, fatigued, and generally “off,” it’s easy to assume you’re coming down with the flu or another viral illness. But sometimes, these symptoms can have a surprisingly simple cause: dehydration. Dehydration doesn’t just make you thirsty, it can affect nearly every system in your body. In some cases, it can even mimic flu-like symptoms, making it difficult to tell what’s really going on. Understanding how dehydration impacts ...