So many odd physical conditions ended up being the result of dehydration and went away once I started drinking water throughout my day. I was in my 30s when I learned that one.
And for other people reading this threat - always have a water bottle standing next to you! For me it was a bit game changer to have water quickly accessible. I've also implemented a tradition of drinking a bottle every morning - that immensely helps in getting your body active.
Only downside is that you'll go to the toilet often.
The big ones for me were joint pains, chronic headaches, and cramping that made me feel like I needed to take a painful crap. For some strange reason, that last one only occur in the middle of the night and it would last for a good hour or so.
Hmm, I never suffered any conditions when I was chronically mildly dehydrated. I haven’t noticed any benefits after 2 years of being slightly over-hydrated.