My mother in law is having pain on the left side of her brain(not scalp, not cranium, but brain). She explains it as though she can feel that the pain is her brain (not a headache, but rather under the skull. She also says that she has been experiencing short term shooting pains down the left side of her arms. What could this be? I have a bit of medical knowledge from my career, and I know that if you re experiencing symptoms on the left side of your brain, it should affect the right side of your body. Any advice?