3 RISKS IN THE PROCEDURE You may experience soreness or minor bleeding, numbness, tingling, or bruising on the parts where the needles were inserted. Very rarely a needle may stick, bend or break following insertion. I use single-use, sterile disposable needles in my practice. There are cases where nausea or drowsiness can occur; this is a good sign of the effects of the procedure. However, if symptoms worsen or continue after 2 days, please notify me. With this, I also do not advise driving after a procedure if you are affected. I will ensure you are OK before you leave my practice.