The two large nerves that run through the shin are the Tibial and Common Peroneal, which are branches of the Sciatic nerve. These two have multiple branches of their own and supply everything in the lower leg and foot.
This means they can produce a number of symptoms from burning, pins and needles, numbness as well as the occasional weird and wonderful like sweating or mottling of the skin.
The problems can be related to lower back issues, but due to the often tortuous route they take through the shin and calf they can become irritated or caught. The trick is to find where the catching occurs and to free it off. The site of catching is not always where the pain is felt, which makes it interesting.
However, this sort of condition can linger for months if left untreated by Physios not knowing what they are looking for! We do!