Constipation is more than just an inconvenience for those who have brain aneurysms. Researchers discovered that the risk of a brain bleed could increase more than seven times due to straining to poop. Excessive exercise, extreme rage, coffee or soda consumption, startling, and sexual activity are additional causes of aneurysms. Although less frequent, head trauma, brain tumors, and infections can occasionally cause aneurysms to form or burst.