A 2012 study out of the Mayo Clinic found that children who had been repeatedly exposed to anesthetic at a young age were twice as likely to develop ADHD. If a child had undergone anesthesia more than two times before the age of three, the risk of ADHD doubled. The research found that the risk does not change with one exposure to anesthesia, but a second exposure jumped the ADHD incidence from 7.3 percent to 17.9 percent.
