A sign of dehydration. Wrinkles on the finger tips that is. I been talking to a bunch of others with fibromyalgia and they seem to get this way easily as well. See our body seems to work overtime getting rid of fluids. I do actually drink a lot of water but still seem now and then to end up dehydrated. This may actually acvouac for the constant headache most of us seem to have. My kidneys and liver are always in God health ither than one kidney has a cyst on it. Get them tested in blood work every 6 months. So yeah no idea why we all seem to pee way more than others.