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Causes
By Mayo Clinic staffParents may blame themselves when a child is diagnosed with ADHD, but the causes likely have more to do with inherited traits than parenting choices. At the same time, certain environmental factors may contribute to or worsen a child's behavior. Although there's still a lot that isn't known about ADHD, several factors may cause it:
- Altered brain function and anatomy. While the exact cause of ADHD remains a mystery, brain scans have revealed important differences in the structure and brain activity of people with ADHD. For example, there appears to be less activity in the areas of the brain that control activity levels and attention.
- Heredity. ADHD tends to run in families. Several genes that may be associated with ADHD are currently being studied.
- Maternal smoking, drug use and exposure to toxins. Pregnant women who smoke are at increased risk of having children with ADHD. Alcohol or drug abuse during pregnancy may reduce activity of the nerve cells (neurons) that produce neurotransmitters. Pregnant women who are exposed to environmental poisons also may be more likely to have children with symptoms of ADHD.
- Childhood exposure to environmental toxins. Preschool children exposed to certain toxins are at increased risk of developmental and behavioral problems. Exposure to lead, which is found mainly in paint and pipes in older buildings, has been linked to disruptive and even violent behavior and to a short attention span.
- Food additives. Substances added to food, such as artificial coloring or food preservatives, may contribute to hyperactive behavior. Although sugar is a popular suspect in causing hyperactivity, there's no reliable proof of this.
References
- Attention deficit/hyperactivity disorder. National Institute of Mental Health. http://www.nimh.nih.gov/health/publications/attention-deficit-hyperactivity-disorder/adhd_booklet.pdf. Accessed Nov. 10, 2010.
- Attention-deficit/hyperactivity disorder. In: Diagnostic and Statistical Manual of Mental Disorders DSM-IV-TR. 4th ed. Arlington, Va.: American Psychiatric Association; 2000. http://www.psychiatryonline.com. Accessed Nov. 10, 2010.
- Rucklidge JJ. Gender differences in attention/deficit hyperactivity disorder. Psychiatric Clinics of North America. 2010;33:357.
- Clinical practice guideline: Treatment of the school-aged child with attention-deficit/hyperactivity disorder. Elk Grove Village, Ill. American Academy of Pediatrics. Subcommittee on Attention-Deficit/Hyperactivity Disorder and Committee on Quality Improvement, et al. Pediatrics. 2001;108:1033.
- Rader R, et al. Current strategies in the diagnosis and treatment of childhood attention-deficit/hyperactivity disorder. American Family Physician. 2009;79:657.
- Spencer T. Attention-deficit/hyperactivity disorder. In: Ebert MH, et al. Current Diagnosis & Treatment: Psychiatry. 2nd ed. New York, N.Y., McGraw Hill Medical; 2008. http://www.accessmedicine.com/content.aspx?aID=3290305. Accessed Nov. 10, 2010.
- Wilms Floet AM, et al. Attention-deficit/hyperactivity disorder. Pediatrics in Review. 2010;31:56.
- Krisanaprakornkit T, et al. Meditation therapies for attention-deficit/hyperactivity disorder (ADHD). Cochrane Database of Systematic Reviews. 2010:CD006507. http://www.cochrane.org/reviews. Accessed Nov. 10, 2010.
- Larzelere MM, et al. Complementary and alternative medicine usage for behavioral health indications. Primary Care Clinics. 2010;37:213.
- Swintak CC (expert opinion). Mayo Clinic, Rochester, Minn. Nov. 19, 2010.
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