<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been feeling weak in my legs and my lymph nodes in my neck are swollen. I also noticed that my neck is swollen and theres a mass in it. Whats going on?  <response>: Based on your symptoms, its possible that you have thyroid cancer. Its important that we do some tests to confirm the diagnosis and determine the best course of treatment for you. 