ADHD the most common global health problem, like other common medical and psychiatric disorders, is influenced by multiple genes, non-inherited factors and their interactions. Research does not support commonly held views that ADHD is caused by eating too much sugar, watching too much television, parenting, or social and environmental factors such as poverty or family chaos. The exact causes of ADHD are not fully understood, although a combination of factors are thought to be responsible.
Genetics
ADHD disorder runs in families. In most cases, the genes you inherit from your parents are thought to be a major factor in developing the condition. Research shows that parents and siblings of someone with ADHD are more likely to have ADHD themselves. However, the way ADHD is inherited is likely to be complex and is not thought to be related to a single genetic fault.
Brain function
The parts of the brain that control attention is less active in children
with ADHD. Research has identified a number of potential differences between
the brains of people with ADHD and those without the condition, although their
exact significance is unclear. For example, studies involving brain scans have
suggested that some areas of the brain may be smaller, while others may be
larger, in people with ADHD.
Brain injury or brain disorder
Damage to the front part of the brain, called the frontal lobe, can cause difficulty controlling movements and emotions.
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