Attention-deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by significant problems with attention, hyperactivity, or impulsivity. ADHD is one of the most common childhood disorders and frequently continues through adolescence and into adulthood. In the US, approximately 11% of children 4-17 years old and about 4.4% of adults are diagnosed with ADHD. ADHD diagnosis rates vary based on the specific criteria used for diagnosis, so these figures are not exact and may vary by a few percent. Although ADHD's diagnoses are disproportionately male, evidence suggests that ADHD is often overlooked and subsequently underdiagnosed in females due to differences in how ADHD symptoms present themselves. Despite public perceptions that ADHD is overdiagnosed, evidence suggests that there is no systemic issue of overdiagnosis. However, there may well be small-scale (regional) cases of both overdiagnosis and underdiagnosis. Although the number of people diagnosed by ADHD has risen in recent decades, research suggests that the actual prevalence of the disorder has not increased in the past three decades. ADHD is not a mental disorder and there is evidence of physical changes in the brains of people with ADHD.
Because the actual cause of ADHD remains elusive to medical science (although the general consensus is that genes play a large role), that leaves plenty of room for quack doctors to speculate all the livelong day on what causes it and offer up their own advice on how to treat it.
NaturalNews - says ADHD is a scam of Big Pharma and psychiatry, speculates that mercury from vaccines, common non-organic pesticides, and anesthesia cause ADHD. States that homeopathic cures work better than Ritalin and that eating organic food treats it.