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It stands for attention deficit hyperactivity disorder (ADHD).​
It happened mostly in children but can also happen in teens and may continue into adulthood.
ADHD
​It is a neurodevelopmental disorder (involved the growth and development of brain)
​Children with ADHD may have trouble paying attention, controlling impulsive behaviours (may act without thinking about what the result will be), or be overly active.
“A mean worldwide prevalence of ADHD of ~2.2% overall (range: 0.1–8.1%) has been estimated in children and adolescents (aged <18 years). The mean prevalence of ADHD in adults (aged 18–44 years) from a range of countries in Asia, Europe, the Americas and the Middle East was reported as ~2.8% overall (range: 0.6–7.3%)”.
epidemiology
"The interactions among several genes, which influence multiple neurotransmitters (chemical messenger to transmit the signals in the body) which are serotonin, dopamine & norepinephrine may result in ADHD since each neurotransmitter has their own role."
"There are several risk factors associate with ADHD. For example, boys are more susceptible than to girls. Premature delivery and low birth weight also one of the risk factors of ADHD"
aetio
risk fx
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