My Primary Dr. took me off the Prevacid as it can cause headaches. I quit taking Zyban also in case it or in combo with the prevacid might be the problem. My main fear is brain cancer so want to get rid of any other agent that could be causing the pain.My RAD Dr. made a comment that the reason he was so agressive with the HDR brachitherapy was because oral cancer is so close to the brain. Has anyone ever heard of oral cancer spreading to the brain? I'm probably paranoid as every ache and pain I get I immediately think cancer.Can anyone relate to that?