<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been having muscle pain, back cramps, neck pain, and back pain. I also feel a stiffness in my lower back. What could be the problem?  <response>: Based on your symptoms, it seems that you have lumbago. Lumbago is a term used to describe general lower back pain. Are you experiencing any other symptoms that concern you? 