Hidden Signs of Dehydration That Aren't Just Thirst

23. Eye Twitches – The Hydration-Nerve Link

That persistent, annoying eye twitch? It’s not always stress or screen time. Dehydration can disrupt the delicate balance of electrolytes like potassium and magnesium, which are essential for smooth muscle and nerve function. When hydration dips, your muscles—especially around the eyes—may misfire, causing twitching or spasms. Since these tiny muscles are constantly in use, they’re often the first to respond to imbalances. If you’ve ruled out fatigue and caffeine but your eyelid won’t stop fluttering, your body might be begging for water. Before reaching for eye drops, reach for a glass—hydration could calm the twitch.

24. Sudden Brain Zaps or “Electric” Pulses

Occasional jolts that feel like “brain zaps” or electric pulses in the head or limbs can be unnerving. While often attributed to anxiety or neurological sensitivity, these can also be linked to dehydration. Low fluid levels can impair nerve conductivity and electrolyte regulation, making the brain’s signals feel jumpy or misfired. You’re not imagining it—your nervous system relies heavily on hydration to function smoothly. If these zaps strike out of nowhere, especially when combined with fatigue or lightheadedness, it’s worth asking: when was your last glass of water? Sometimes, the fix is far simpler than it seems.