Signs could be cracked and dry lips, dry tongue, flaky and/or cracking skin, less urine, darker urine, etc. https://www.webmd.com/a-to-z-guides/dehydration-adults#1How do you know if you're actually dehydrated or if it is just a sensation?
I feel like if I don't have frequent sips of water I get dry mouth, skin, dry and cracked lips (actual cuts) (I also have dry eyes since many years), but I found out lately I'm peeing about 1 liter more than what I drink (if I drink 1,5l I pee 2,5l) and the urine seems quite concentrated too (yellow, not clear). I also have frequent diarrhea, which doesn't help. I'm 153cm x 49kg, so pretty small.
I drink about 1,5-2 l, which I think is a correct amount. I don't know if I am actually slightly dehydrated (peeing too much?) or I feel dehydrated, but I'm actually not. Because I guess dehydration could explain some fatigue etc.
Hello, as @Pearshsped said hypo-natremia could be a potential cause. I am not a doctor, so I explain my own experience.
In my case, I noticed it several times after taking heavy antibiotics for months (I have no choice, having urinary TBC and severe recurring hemorragic UTIs).
I noticed because urine was not clean and my urethra, which normally burns like fire, burnt like hell, heavily worsening my symptoms. I started to drink up to 3,5 litres but nothing ...
I was always thirsty no matter how much I drank, and much more tired than normal.
I discovered it was due to mineral salts, and I resolved taking Polase (or similar integrators involving potassium, magnesium ...) and drinking orange juice.
Hope I helped you!