What causes ADHD?

The cause of ADHD is currently not known. It likely involves both genetic and environmental components. Possible causes of ADHD include:
  • physical trauma to the brain [35]
  • problems during pregnancy or delivery [36-37]
  • genetic abnormalities [39-42]
  • differences in brain structure [43-44]
ADHD is not thought to be caused by: [1]
  • watching excessive amount of television
  • food allergies
  • eating too much sugar
  • problems in the home environment
  • problems with quality of schools