To mark October's ADHD Awareness Month, the ADHD Foundation discusses the condition which affects up to 5% of children and outlines the warning signs.
They're often misdiagnosed as 'naughty children' - and even if they're officially diagnosed with ADHD, many kids are still simply labelled as naughty.
But attention deficit hyperactivity disorder (ADHD) is a recognised medical condition that affects around 3-5% of children and 2% of adults. One of the most common neurodevelopmental conditions in childhood, it is described by the NHS as: "A condition that affects people's behaviour. People with ADHD can seem restless, may have trouble concentrating and may act on impulse."
Speaking to mark October's ADHD Awareness Month (adhdawarenessmonth.org), Dr Tony Lloyd, chief executive of the ADHD Foundation (adhdfoundation.org.uk), says: "There are several enduring myths about ADHD. Many parents will no doubt be concerned that a diagnosis of ADHD may be harmful in itself because in the past it's been associated with 'naughty boys', or about giving children drugs to make them behave.
"This is such a tragedy because although one in 20 children have ADHD, less than half of that number are ever assessed or diagnosed - and as many as 50% of children who are referred for an assessment don't in fact have ADHD but instead have behaviours linked to trauma, anxiety or other neurological conditions.
"Sadly, many teachers, and some parents, think ADHD is about bad behaviour. ADHD is not a behavioural disorder - it's a neurodevelopmental condition characterised by a delay in development in certain parts of the brain."
How is ADHD diagnosed?
The Royal College of Psychiatrists (rcpsych.ac.uk) says there's no single, definite test for ADHD and diagnosis requires a specialist assessment by a child psychiatrist or a paediatrician, who will observe the child and look for recognised patterns of behaviour, and get reports of their behaviour at home and school. Diagnosis doesn't usually happen until after the age of six.
What do parents need to look out for?