I'm sorry to hear about the persistent pain in your left knee and back. Pain lasting for two months suggests it would be important to have a thorough evaluation to determine the underlying cause.

Your symptoms could be related to conditions such as arthritis, muscle strain, or spinal issues. For example, osteoarthritis or other inflammatory joint conditions can cause joint pain and stiffness, while back pain might be related to spinal disc problems or muscle strain.

A medication like Naprosyn (naproxen), which is a non-steroidal anti-inflammatory drug (NSAID), is often used to reduce pain and inflammation in such conditions. However, it is important to use it under medical supervision due to potential side effects like stomach irritation or cardiovascular risks.

Recommendations:

• Please consult a rheumatologist or an orthopedic specialist who can perform a detailed physical examination and may recommend imaging studies (like X-rays or MRI) to identify the cause of your knee and back pain.
• Avoid self-medicating for prolonged periods without professional guidance.
• If you experience worsening pain, swelling, redness, fever, or any new symptoms, seek medical attention promptly.

Taking these steps will help ensure you receive an accurate diagnosis and appropriate treatment to relieve your symptoms effectively.To narrow down potential causes, we will need some more information.Please tell me your age and gender. I understand that you have been experiencing pain in your left knee for the past two months, along with back pain.