I have had more than anyone i know 34 in 2 1/2 years!!! They do not tell you that they can and do cause more nerve damage !!!!
Look up the term "arachnoiditis"
it is a inflamation of the nerve roots and adhesive arachnoiditis is a scar tissue that starts growing and and destroying the mylen sheath that protects the nerve root the studies have shown that even sterile water causes scaring of the nerve root!!! Please look up the terms and do not have anymore done they may help in short term for pain but long term effect is a hell you do not want to know !!!!