Can hitting your head cause brain aneurysm? Mild to severe head trauma with pain resolution after 4 minutes.

No, not possible. No, trauma to the head cannot cause an aneurysm. But I want to make sure we are using the terms in a similar fashion. An aneurysm is an unstable blood vessel, a bleed in the brain is a different process. A hard enough trauma could cause bleeding in the brain or it could (rarely) cause rupture of an existing aneurysm.