As a disc degenerates, the soft inner gel in the disc can leak back into the spinal canal. This is known as disc herniation, or herniated disc. Once inside the spinal canal, the herniated disc material then puts pressure on the nerve, causing pain to radiate down the nerve leading to sciatica or leg pain (from a lumbar herniated disc) or arm pain (from a cervical herniated disc).
Herniated disc
Source: http://www.spineuniverse.com/conditions/herniated-disc
About the causes, symptoms and treatment aspects of the herniated disc, Aleksandar Zivkovic spoke with Dr Velibor Todorovic.
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