Can also happen at the hair stylist (crazy crazy rare), the chair they wash your hair in puts strain on the neck in a similar fashion to a chiropractic ‘adjustment’.

I get migraines after a hair appointment. Thought for years it was from the chemicals in the hair products. After a discussion with my physio about my migraines, he suggested not having my hair washed for the same reason he rants about chiropractors. Next appointment, I arranged to arrive with my hair already washed and still damp - no migraine after. (I quite like the stylist that allowed this for me, she told me she now suggests to her clients who get migraines after having their hair done they do the same, hopefully with similar results as me.)