### Patient: Doctor, I've been experiencing some blood in my urine and knee pain. What could be the cause of this?
### Doctor: Based on your symptoms, you may be suffering from Von Hippel-Lindau disease. This is a rare genetic disorder that can cause various types of tumors to grow in different parts of the body, including the kidneys and joints. Note: This dialogue is for educational purposes only and should not be taken as medical advice. If you are experiencing any concerning symptoms, please consult with a healthcare professional.