A “slipped disc” is known in osteopathic circles as a herniated or prolapsed disc. It is not uncommon to have a disc problem affecting the nerve that travels into your leg, without any low back pain at all. The disc, which sits between the bones of the spine like a shock absorber, has very little nerve supply itself so you can damage it without being aware of any back pain. It is only when the bulging part of the disc (imagine slashing a tyre and the inner tube bulges out) pushes on the nerve where it exits the spinal column that you start to get pain in the distribution of the nerve; the nerves from your lower back travel down your leg all the way to the toes, hence the pain and tingling in the leg. (It is important to note that some nerves in the lower back go to the bladder – if you experience any difficulty passing water, especially if you go for hours with a marked reduction in your normal production of urine, go to A&E.)