I think there may be something to this, but, I would have poo-pooed the idea 6 months ago. I am in nursing school where one is very stressed out and tired all the time. I would get blinding fatigue headaches that no analgesic would touch One day it came to me that maybe the fatigue headaches were linked to dehydration in some oblique way. On the surface at least, I should have been well hydrated. I was drinking the recommend daily amount of fluids so it seemed like an unlikely cause for the pain.
I began to really pay attention and to drinking lots of H20, especially when I was doing clinicals when I had been awake 48 hrs straight . The headaches totally went away. I am not getting any more sleep because of the demand of the nursing program, but at least I don’t have headaches all of the time like I did. Now I wonder if dehydration may have other signs and symptoms that are not usually recognized as such
My brother also advised me to drink more water when I was having back pain. He reminded me that disks contain a lot of water, and that when we are dehydrated, they are less able to cushion our spines. I've found it somewhat helpful.