Radiculopathy is caused by compression of a nerve root from the spinal cord, which can cause pain radiating into the arm or leg. The compression can be from an acute injury like whiplash or trauma, or develop slowly over time from thickening ligaments or arthritis. Whether a compressed nerve can heal depends on the severity and duration of compression. Nerves have the ability to recover if the compression was not too forceful or long-term. Recovery occurs at a rate of 1 mm per day, with pain usually improving first followed by paralysis and finally numbness. Complete recovery is possible with decompression of the nerve, depending on the extent and duration of the original compression.