How can i tell if i should get checked for a brain tumor or anyuresm?

Difficult: There is no way to know if you have a brain tumor or aneurysm, both may have the same symptoms or no symotps, both need a brain scan. Better discuss your concerns and symptoms with your doctor and let him evaluate if you need a scan or not.

Symptoms or history: There is no reason to be checked for either of these unless you are having neurologic symptoms that suggest these may be possible or you have a genetic disease that predisposes to one of these. I would discuss your concerns with your primary care physician.