DehydrationDehydration, or the loss of bodily fluids, is a concern in both hot and cold weather. The condition may occur as a result of excessive sweating, overeating, vomiting, diarrhea, or heat exhaustion. It causes muscles to become weak and thinking to become confused. Campers need to drink large quantities of water before they become thirsty, because thirst is not a reliable indicator of the body’s needs. Drinking large quantities before hitting the trail helps provide the body with sufficient fluids.