8 . 5 %). ▁Other ▁head aches ▁diagn osed ▁in ▁the ▁emer gency ▁department ▁include ▁post - tra um atic ▁head ache ▁( 2 0 % ), ▁head ache ▁related ▁to ▁a ▁problem ▁with ▁a ▁vent ric ul oper it one al ▁sh unt ▁( a ▁device ▁put ▁into ▁the ▁brain ▁to ▁remove ▁excess ▁C SF ▁and ▁reduce ▁pressure ▁in ▁the ▁brain ) ▁( 1 1 . 5 %) ▁and ▁mig raine ▁( 8 . 5 %). ▁The ▁most ▁common ▁serious ▁head aches ▁found ▁in ▁children ▁include ▁brain ▁ble eds ▁( sub d ural ▁h emat oma , ▁e pid ural ▁h emat oma ), ▁brain ▁abs cess es , ▁men ing itis ▁and ▁vent ric ul oper it one al ▁sh unt ▁mal function . ▁Only ▁ 4 – 6 . 9 % ▁of ▁k ids ▁with ▁a ▁head ache ▁have ▁a ▁serious ▁cause . ▁ ▁Just ▁as ▁in ▁adult s , ▁most ▁head aches ▁are ▁ben ign , ▁but ▁when ▁head ▁pain ▁is ▁accompanied ▁with ▁other ▁sympt oms ▁such ▁as ▁speech ▁problems , ▁mus cle ▁weak ness , ▁and ▁loss ▁of ▁vision , ▁a ▁more ▁serious ▁underlying ▁cause ▁may ▁exist : ▁hydro ce phal us , ▁men ing itis , ▁en ce phal itis , ▁abs cess , ▁hem or rh age , ▁tum or , ▁blood ▁cl ots , ▁or ▁head ▁tra uma . ▁In ▁these ▁cases , ▁the ▁head ache ▁evaluation ▁may ▁include ▁CT ▁scan ▁or ▁M RI ▁in ▁order ▁to ▁look ▁for ▁possible ▁struct ural ▁dis orders ▁of