Research suggest that genes are involved – a third with a diagnosis of ADHD have at least one parent with similar difficulties. Research also suggests that ADHD is common amongst individuals if their mothers had difficulties during pregnancy and/or childbirth. These include exposure to drugs or medications in pregnancy, low weight at birth, brain infections, exposure to poisons and some forms of stress to the mother.
There is also evidence in differences of brain structure with individuals diagnosed as ADHD, but environmental factors in life can also make a person more prone to develop ADHD.
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