important structures." If you've been diagnosed, make an appointment with a specialist who sees at least 10 patients per year with these tumors, Sills suggests. The course of action may often be just observation, but a specialist could also recommend radiation or surgery. Know What to Look For Usually meningiomas don't have symptoms -- that's why many people don't even know they have them. That said, a seizure could be a sign that growing tumor cells are irritating your brain tissue. If you have an unexplained seizure, notice headaches, unexplained weakness, or personality and memory changes, see a doc. While these aren't telltale signs that you're housing a tumor, they're some of the only symptoms you'd see if you do have one -- that's why you need to have a doc find the source of your symptoms. (And don't ignore these 6 Health Worries You Need to Address .)