<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing weakness and headache, and even my appetite has decreased. I also have this strange leg weakness that I cant seem to shake off. What could be wrong with me?  <response>: Based on your symptoms, it is likely that you have brain cancer. We will need to run some tests to confirm the diagnosis and determine the best course of treatment. 