Spinal decompression is a type of surgery to relieve symptoms caused by pressure on the spinal cord and/or the nerves branching off from it. Pressure (compression) on the nerves or spinal cord can be the result of several factors including:

Bulging or herniated discs
Bony growths
Loosened ligaments.

Symptoms of spinal nerve compression in the low back include:

Pain in the low back, as well as in the buttocks and down the leg
Numbness or tingling in the buttocks, leg and foot
Weakness

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