
What Causes Pain Below Knees?

It could be the exertion or Simvastatin.
Detailed Answer:
Hello XXXXXXX
This seems like a muscular pain to me completely taking into consideration the Tennis starting recently. Is there any swelling in the limbs? Any redness or color changes? Does the aching decrease on elevating the limbs or increase or no effect?
I suggest you stop Naproxen and start taking Paracetamol instead. Another option is to add Tab Pantoprazole 40mg twice a day half an hour before meals and continue the Naproxen as the acidity produced by the Naproxen can be neutralized by Pantocid.
Another reason for the pain could be the Simvastatin that you take. That has a propensity for muscle aches and liver dysfunction. I suggest you get your liver function tests done and stop the Simvastatin for a month and then see.
Do not worry.
We are always here to help you and will give you the best advice possible.
Take care,
Dr Rishi, New XXXXXXX XXXXXXX

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