Dear BPT,
Interestingly I used to use both a TENs machine and a Pain Gone Pen for arthritic pain; both send electrical impulses to mix up the pain signals. However I found that practising Qigong actually takes the pain away and I no longer use the machines.
I did use them when I first started Qigong with no detriment but I have been pain free
for over a year just with Qigong.
Hope this helps.
Love & light
Faune