TENS unit?

[krysy8]

has anyone tried the electrical stimulation units for pain relief? my PT has a nice fancyone and uses it on me w heat, it feels soooo excellent. my dr gave a prescrip for on to use at home, its so not the same though. I forgot to ask, how long i can leave it on for, i will ask on Friday.
Do you use one? Does it help w pain relief?
As i understand, the only way it really helps is by tricking the brain into feeling the stimualtion instead of the pain, is that right?