Can one omit making Masah on the head if one has a migraine headache? 

Q. My wife cannot wash her head during Ghusal. If she washes her head, she will have a migraine headache. What does she do?

A. It is compulsory to wash the entire head during Ghusal for males and females. However, if the washing of the head during Ghusal is detrimental to the health of a female or there is fear of aggravating her illness, then it will be permissible for a female to make Mash of the head instead.

Note: In the absence of any detriment to health or aggravation to illness, it will be compulsory to wash the entire head. In such a case, making Masah will not suffice. (Masaail Rifaat Qaasimi 1/144/145)

Allah Ta’ala Knows Best

Mufti Ismaeel Bassa