When you have a herniated disc in the spine (slipped disc), a part of the soft center has moved outwards and could be pressing against the spinal cord or any of the surrounding nerves. This causes pain (from mild to severe) and could also affect areas of your body that are connected to the spinal nerve the hernia is pressing on, including weakness, numbness, or paralysis. Discectomy is done to treat this medical condition and relieve you of your symptoms.