<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been experiencing low back weakness, arm pain, elbow weakness, and diminished vision. What could be the reason for it?  <response>: Based on your symptoms, it appears that you may have a form of thalassemia. This is a genetic blood disorder that affects the production of hemoglobin, which can lead to anemia and a range of symptoms, including those you are experiencing. Well need to conduct further tests to confirm the diagnosis. 