Beware if you're chugging energy drinks -- you might end up in the ER. According to a new government study, the number of emergency room visits linked to energy drinks has doubled over four years, from 10,000 in 2007 to 20,000 in 2011.

The study, based on a survey of U.S. hospitals by the Substance Abuse and Mental Health Services Administration, calls energy drinks "a rising public health problem."

Source: ABC News