Hidden Signs of Dehydration That Aren't Just Thirst

49. An Increase in Anxiety

Beyond general mood swings, a subtle but significant sign of dehydration can be a noticeable increase in anxiety. Your brain relies on a delicate balance of hormones and neurotransmitters, and even a small fluid imbalance can disrupt this. Dehydration can increase cortisol (the stress hormone) and decrease serotonin, leading to a heightened state of anxiety. If you feel more on edge or have a racing mind for no clear reason, try a glass of water. It's a simple, foundational step to help your nervous system regulate itself and restore a sense of calm.

50. Blurred Vision or Eye Strain

Dehydration can have a surprising effect on your vision. Your eyeballs are mostly fluid, and a lack of water can impact their shape and function. Dehydration can cause a decrease in tear production, leading to dry, irritated eyes and blurry vision. It can also cause a temporary inability to focus, which is often dismissed as simple eye strain from too much screen time. If your vision is consistently fuzzy or your eyes feel tired and uncomfortable, it may be a sign that your body is not properly hydrating your eyes.