My good doctors told me not to do a stimulator until it's absolutely necessary and there's no choice. There's all kinds of problems I've heard and spoken to people who've had a long periods of time and never had difficulties. My next door neighbor who's had it for over a year and a half suddenly started feeling better and they found out the batteries with him ran out. I just stick to moving and marijuana as well as anti-inflammatories and I'll take my chances