Generally, HA r/t to HTN is usually generalized due to acute HTN usually r/t marked diastolic BP of rising over 25%

References:
https://books.google.com/books?id=aV1kEf7mlckC&pg=PA435&dq=hypertension+headache+generalized&hl=en&sa=X&ved=0ahUKEwij5pTdnMHSAhVnlFQKHTR9D1gQ6AEIJTAC#v=onepage&q=hypertension%20headache%20generalized&f=false


https://books.google.com/books?id=6n5cAgAAQBAJ&pg=PA59&dq=hypertension+headache+generalized&hl=en&sa=X&ved=0ahUKEwij5pTdnMHSAhVnlFQKHTR9D1gQ6AEIPDAG#v=onepage&q=hypertension%20headache%20generalized&f=false