(Kelly of the Clue Crew shows a brainy animation on the monitor.)  When cerebral arteries become dilated, it can often lead to this vascular pain also known as cephalalgia
[DOC] [TLE] Migraine is not Caused by Blood Vessel Dilation - TheMedCircle- Dr ... [PAR] May 8, 2013 ... No noticeable differences in the state and size of brain's arteries were found.