Jet lag is a common travel nuisance that can turn an exciting journey into an exhausting ordeal. It occurs when there’s a mismatch between your internal body clock and the new time zone you’re in.
Here's a guide to these illnesses, from symptoms to treatment. What it is: A bacteria that lives in the intestines of people and animals, and is known as Escherichia coli, or E. coli. Though it is ...