Hi there, my mother has been having a pins and needles/burning sensation behind her right knee and in her buttocks when she's sitting or sleeping. Does anyone know what's causing this?
The symptoms you describe can sometimes be caused by a problem in the lower back, like a pinched nerve or herniated disc. Here's a link to an article that may be helpful: Sciatica: What is it?
Your mom should see her doctor to find out what is causing her discomfort so she can get the appropriate treatment. It sounds like there could be some nerve involvement, and getting help for that as soon as possible is important.
Here's some information on nerve pain that might be helpful:
Nerve Pain at a Glance
Neuralgia – An Overview
What Can Be Done for Nerve Pain?