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But for others , hair pulling is so automatic or habitual that they may do it unconsciously — they do n't realize that they're doing it . If you have typical migraine headaches or a family history of migraines , your doctor will likely diagnose the condition on the basis of your medical history and a physical exam . He used his speech chiefly to criticize other presidential candidates who voted for the resolution authorizing war in Iraq . They're aware that they're pulling their hair out while they're doing it , and they may even develop elaborate rituals around hair pulling . But they're more common in men and people who are prone to migraines . A total sale of the lottery also likely would require a state constitutional amendment . Suppose , for instance , that one vehicle unexpectedly slows down , then speeds up . " These graphs allowed me to study the aesthetic characteristics of functions , sequences , and series in a purely visual language , " Happersett says . Cars far from the offending vehicle can find themselves unexpectedly caught up in localized traffic jams that have no apparent cause . Some people are n't aware that they're plucking out their own hair .