I've heard of a few people getting a brain aneurysm or brain bleeding after straining too hard to poop.
So if you need to poop and are having a hard time pooping you should avoid straining too hard because a few people have gone into the emergency room due to having an aneurysm that happened soon after straining to poop or even after having sex.
So according to some doctors and surgeons it's possible to get a brain aneurysm from straining to poop or have a bowel movement.
I can feel pressure on my own brain and get a slight headache after straining somewhat to poop.
If I start feeling a bit of pressure on my brain when straining to poop I stop straining and wait for awhile to try again to have the bowel movement.
If you're straining to poop then it could be caused by constipation and you would need to take some laxatives or drink some prune juice etc to help get your stools softened and help get your bowels moving.