<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing a lot of fatigue lately, and my joints feel stiff and tight. I also have been having shoulder cramps and spasms. What could be the problem?  <response>: Based on your symptoms, it sounds like you may have congenital rubella. Have you had any other symptoms such as a rash, fever or swollen lymph nodes? 