Hello doctor, at times my legs get numbed as i walk, or even wen i stand for a long period of time, an then it goes limp, what is the possible cause of this as i suffer with pain in my lower back as well. regard, chris?

Numbness on walking: Spinal stenosis from various causes comes to mind in view of associated low back pain. Compression of spinal cord or bilateral nerve roots from disc disease is another possibility. Arterial blockages affecting both legs usually causes leg pain on walking. I'd start with an evaluation by an orthopedic surgeon or a spine clinic. Appropriate studies such as an MRI will most likely be performed.