Extreme Thirst
Always, always listen to your body and drink when you’re thirsty. Extreme thirst is a real cause for alarm—and a tall glass of water (or three).
Dry Mouth
Even if you don’t think you’re thirsty, if your mouth and tongue are dry and sticky, it’s a sign you’re past the point of thirst. According to the Mayo Clinic, it’s a symptom of dehydration.
Sleepy
Sure, summer and the heat call for lazy days. But if you’re always feeling sleepy, possibly borderline lethargic, it might not be the heat. It may be that you’re dehydrated. Try upping the amount of water you drink. Your body is telling you something.
Can’t Pee
Haven’t peed in awhile? That might be because your body has run out of excess fluids. You should be going six to eight times a day. Up to 10 times is also totally healthy and a sign that you’re hydrated.
Dark Yellow Urine
If your urine is a little darker yellow than usual, and you have no other health problems, this could be a sign that you’re dehydrated. Often, bathrooms aren’t easily available around summer hot spots, like the pool, the beach or while traveling abroad. But don’t use that as a reason to decrease water intake. You need to stay hydrated.