Side Effects
As displayed in the tables below, the likelihood of achieving positive side effects is quite high while the chances of accruing negative side effects is ​​​​​​​​​​​​ very, very low.  Keep in mind, the positive side effects are in addition to the pain relief you will likely receive. 
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*The above tables are taken from Yun-tao Ma's textbook, "Dr. Ma's Neurologic Dry Needling," (pages 275 - 276), [2016].