Hello, It is a transient ischemic attack that is caused by a blocked artery, but the symptoms clear up completely, usually in under an hour. Most TIAs last only five or ten minutes long. Because they are brief and not painful. However, a TIA may precede a stroke by days or weeks and represent a warning sign. He should undergo a comprehensive evaluation quickly because sometimes an underlying problem is discovered which can be treated, averting a stroke. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr. Blerina Pasho, General & Family Physician