Staying hydrated is essential for your overall health. Here are six signs that you might be more dehydrated than you think: Bad Breath Bad breath has many causes, but dehydration is one of them. This is because your saliva production goes down, making it less likely to kill odors from food.  Hunger You constantly feel hungry. Sometimes, what seems like hunger is actually your body's way of telling you that it needs water instead of food. Headaches Headaches are a notorious symptom of dehydration. Being dehydrated can cause fluid to shift out of the brain, resulting in a pounding pain.  Blurry Vision Dehydration can cause blurry vision by reducing tear production, which affects eye lubrication and disrupts the tear film that keeps vision sharp. Constipation Constipation is another key sign of dehydration, as water regulates and aids digestion so that food can pass through your system healthily.  Low Mood Dehydration can cause neurological effects that lead to irritability. So, next time you're in a bad mood, drinking some water might cheer you up!