1 – 5 % ▁of ▁people ▁who ▁seek ▁emer gency ▁treatment ▁for ▁head aches ▁have ▁a ▁serious ▁underlying ▁cause . ▁ ▁More ▁than ▁ 9 0 % ▁of ▁head aches ▁are ▁primary ▁head aches . ▁Most ▁of ▁these ▁primary ▁head aches ▁are ▁t ension ▁head aches . ▁Most ▁people ▁with ▁t ension ▁head aches ▁have ▁" ep is od ic " ▁t ension ▁head aches ▁that ▁come ▁and ▁go . ▁Only ▁ 3 . 3 % ▁of ▁adult s ▁have ▁chron ic ▁t ension ▁head aches , ▁with ▁head aches ▁for ▁more ▁than ▁ 1 5 ▁days ▁in ▁a ▁month . ▁ ▁Appro xim ately ▁ 1 2 – 1 8 % ▁of ▁people ▁in ▁the ▁world ▁have ▁mig ra ines . ▁More ▁women ▁than ▁men ▁experience ▁mig ra ines . ▁In ▁Europe ▁and ▁North ▁America , ▁ 5 – 9 % ▁of ▁men ▁experience ▁mig ra ines , ▁while ▁ 1 2 – 2 5 % ▁of ▁women ▁experience ▁mig ra ines . ▁ ▁Cl uster ▁head aches ▁are ▁very ▁rare . ▁They ▁affect ▁only ▁ 1 – 3 ▁per ▁thousand ▁people ▁in ▁the ▁world . ▁Cl uster ▁head aches ▁affect ▁approximately ▁three ▁times ▁as ▁many ▁men ▁as ▁women . ▁ ▁History ▁▁ ▁The ▁first ▁recorded ▁classification ▁system ▁was ▁published ▁by ▁Are ta eus ▁of ▁C app ad ocia , ▁a ▁medical ▁scholar ▁of ▁Gre co - R oman ▁anti qu ity . ▁He ▁made ▁a ▁distinction ▁between ▁three ▁different ▁types ▁of ▁head ache : ▁i ) ▁ce phal alg ia ,