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Major stress on the body can accelerate the dehydration process – whether it's intentional, like running a 5K, or unintentional, like getting a nasty stomach bug.

With the winter cold and flu season upon us, Americans should be on the lookout for another ultra-contagious virus: our most common stomach bug.

Some places in the U.S. are seeing an uptick in cases of the stomach bug known as norovirus.

Other federal agencies are also investigating the health concerns of nearby residents who have been suffering respiratory illnesses and unexplained stomach bugs.

Problems with the stomach bug had been going on for weeks, according to passengers on previous sailings.