This kind of itching may sometimes be very difficult to diagnose since the causes are many. If other reasons for itching are ruled out (hemorrhoids, etc...), I would treat for the most common cause (pinworms) even if the tests are negative.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.