Research supports the close association between dopamine and Internet addiction. One recent study found changes in brain function and dopamine levels in people who compulsively use the Internet. Body aches, Carpal Tunnel Syndrome, insomnia, vision problems, and weight gain/loss are just some of the physical problems one may suffer as a result of an internet addiction. Emotional effects may include depression, dishonesty, anxiety, social isolation, aggression, and mood swings. Despite the advocacy of categorizing Internet addiction as an established illness, neither DSM-IV (1995) nor DSM-5 (2013) considers Internet addiction as a mental disorder.