According to the Associated Press, a survey conducted by the Substance Abuse and Mental Health Services Administration showed that energy drink-related ER visits have doubled, from 10,000 to 20,000, since 2007. In more than half of cases, patients told doctors they had consumed only energy drinks, while other substances were involved in about 40 percent of incidents. The report calls energy drinks a “rising public health problem” that can cause insomnia, nervousness, headache, fast heartbeat and seizures. The FDA said it was considering the findings and asking for more details as it reviews the safety of energy drinks and related ingredients this spring.