What if u have a headache on the left side of your head and it's in and off! i sometimes get dizzy to and nausiated! tumor???

Headache: Sounds like you have a headache or migraine. Dizziness and nausea can occur with either, but we often become concerned about nausea and dizziness because it can be a sign of increased pressure in your brain. A tumor is only one out of the many causes of headaches. You should be evaluated by a physician to ensure that a more dangerous condition is not going on.