The need for surgery is assessed based on the neurological deficits that the compression is causing. If it is causing any weakness then surgery is definitely recommended. If pain is uncontrolled then also surgery can be considered. other methods of treatment are strict bed rest
and physical therapies. Some times injections at the local area can also give prolonged relief.
The type of surgery is determined by the location of the disc bulge. Basically the part of disc which is compressing on the nerves is cut and removed.