pt ans , ▁medic ations ▁which ▁treat ▁mig ra ines , ▁block ▁ser ot on in ▁re cept ors ▁and ▁con str ict ▁blood ▁vessels . ▁ ▁People ▁who ▁are ▁more ▁sus cept ible ▁to ▁experience ▁mig ra ines ▁without ▁head ache ▁are ▁those ▁who ▁have ▁a ▁family ▁history ▁of ▁mig ra ines , ▁women , ▁and ▁women ▁who ▁are ▁experien cing ▁h orm onal ▁changes ▁or ▁are ▁taking ▁birth ▁control ▁p ills ▁or ▁are ▁pres cribed ▁h orm one ▁replacement ▁ther apy . ▁ ▁T ension ▁head aches ▁are ▁thought ▁to ▁be ▁caused ▁by ▁activation ▁of ▁peri pher al ▁n erves ▁in ▁the ▁head ▁and ▁neck ▁mus cles ▁▁ ▁Cl uster ▁head aches ▁involve ▁over activ ation ▁of ▁the ▁trig em inal ▁n erve ▁and ▁hypoth al am us ▁in ▁the ▁brain , ▁but ▁the ▁exact ▁cause ▁is ▁unknown . ▁ ▁Di agnostic ▁approach ▁▁ ▁Most ▁head aches ▁can ▁be ▁diagn osed ▁by ▁the ▁clin ical ▁history ▁alone . ▁If ▁the ▁sympt oms ▁described ▁by ▁the ▁person ▁sound ▁dangerous , ▁further ▁testing ▁with ▁ne uro im aging ▁or ▁lum bar ▁pun ct ure ▁may ▁be ▁necessary . ▁Elect ro ence phal ography ▁( E EG ) ▁is ▁not ▁useful ▁for ▁head ache ▁diagn osis . ▁ ▁The ▁first ▁step ▁to ▁diagn osing ▁a ▁head ache ▁is ▁to ▁determine ▁if ▁the ▁head ache ▁is ▁old ▁or ▁new . ▁A ▁" new ▁head ache " ▁can ▁be ▁a ▁head ache ▁that ▁has ▁started ▁recently , ▁or ▁a ▁chron ic ▁head ache ▁that ▁has ▁changed