The last thing anyone wants is for sex to be a headache. For some people, though, an increase in sexual excitement can be a real pain in the neck.
Primary headache associated with sexual activity (PHASA) describes at least two bouts of pain in the head or neck brought on by sexual activity. The headache can escalate gradually during sexual activity or it can be an intense headache just before or during orgasm.
PHASA can be intense for between a minute to 24 hours or mild for up to three days.