<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing arm weakness and stiffness, and overall weakness. What could be the problem?  <response>: Based on your symptoms of arm weakness, arm stiffness or tightness and overall weakness, it seems like you have Hemiplegia - a condition that leads to weakness or paralysis on one side of your body. We need to run some tests to confirm the diagnosis. 