For the diagnosis to be given to an adult, the individual must have symptoms which began in childhood and are ongoing up to the present.
These may include distractibility, impulsivity and restlessness.
This a site has a number of questionnaires designed to aid in the evaluation of the severity of the condition.
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Because adults with ADHD do not usually believe they have the condition, it may take a specific event to trigger their suspicions.
For example if their child is being assessed for or has been diagnosed with ADHD, or once the adult seeks medical advice for another issue such as anxiety, depression or an addiction.
There are tips to cope with ADD within a relationship, a forum for discussion and some articles on current ADD research.