Lack of concentration and restlessness are two symptoms of
ADHD.
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No
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The main symptoms of ADHD are inattention and hyperactivity, as
the name suggests. For a full rundown of more specific behaviors,
check out this WebMD article:
http://www.webmd.com/add-adhd/guide/adhd-symptoms .
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Some symptoms of ADHD in a child include hyperactivity and
trouble concentrating. Some children are thought to have a hot
temper while they in fact have ADHD.
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There are lots of sites with information about ADHD symptoms.
The WebMD and Healthline sites are both great sites with accurate
information about ADHD in both children and adults.