I have had stabbing pain on the left side of my head for a few months now, but it has started to get worse. it's short and in the same spot. tumor?

Headache: If these symptoms persist, you should see a neurologist that specializes in headache management.

Not sure: It's hard to say. There are some nerve conditions not related to cancer which can cause these symptoms. I recommend a thorough examination with your primary care physician. You may need an MRI of your brain to help find the answer.