2. Dehydration -- Information from Healthwise
This can happen when you stop drinking water or lose large amounts of fluid through diarrhea, vomiting, sweating, or exercise.. This can happen when you stop drinking water or lose large amounts of fluid through diarrhea, vomiting, sweating, or...
http://www.everettclinic.com/kbase/topic/symptom/dehyd/overview.htm

3. Dehydration -- Information from the Merck Manual
Before exercising, people with heart or kidney disorders should consult their doctor about how to safely replace fluids. Water moves from inside the cells to the bloodstream to maintain the needed amount of blood (blood volume) and blood pressure.
http://www.merck.com/mmhe/sec12/ch158/ch158b.html#sec12-ch158-ch158b-471

4. Dehydration -- Mayo Clinic
Even a slight imbalance causes serious problems because water is essential to human life: It forms the basis for all body fluids, including blood and digestive juices; it aids in the transportation and absorption of nutrients; and it helps...
http://www.mayoclinic.com/invoke.cfm?objectid=5C302784-080C-4278-B4953F801900B4...