Got a Medical Question? Ask a Doctor Online!
That is little concerning.
When you sit down on the toilet seat, the pressure in the brain can increase causing severe headaches.
Given your history of metastatic colon cancer in the past, brain tumor or aneurysm need to be ruled out.
Please see your doctor soon for a MRI scan of the brain.
Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the smiley faces) under this chat box only.Please bookmark my profile for asking further questions!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/