I have low back pain my knee and leg are cold what could be wrong?

Sciatica: Sciatica, or in medical terms lumbosacral radiculopathy, is commonly associated with differences in temperature to the affected extremity. Not all patients will complain of noticeable weakness, sensory loss or shooting pain. A good physical exam will usually confirm the diagnosis, however. The good news is this condition is usually quite treatable.

PAD: A cool leg to touch, not "feels cool, " implies a problem with blood flow. This may be your first indication of peripheral arterial disease. If accompanied by pain that is worsening, get to the er. Otherwise, consider taking an Aspirin a day and be seen asap by your doc or a vascular surgeon. If this is just a sensation of cold, then a nerve may be compressed. That is not an emergency.