I had never heard of sex headaches before!
What I had been thinking was this but was hesitant to say i - taken from liverock's link:
"Brain bleeds, often result from the rupture of an abnormal blood vessel such as an aneurysm or AVM (arteriovenous malformation).
An aneurysm is an abnormal artery, with bulging walls, somewhat like the bulging area we sometimes see in an overinflated tire inner tube. An AVM is a tangle of abnormal communications between arteries and veins. The walls of aneurysms and AVM's are weak, compared to normal vessels, so elevated blood pressure can cause them to leak or burst. The liberation of blood around or into the brain immediately produces the explosive headache."
I had a friend years ago who had a brain aneurysm that caused him headaches. Fortunately they figured it out before it ruptured and he had brain surgery and it quite well now. Lets hope its the other type of headache for your friend.
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