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My TENS unit instructions said to not use it on the head. Don't know why though.
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My offhand guess would be what the FDA has approved the unit for, but I could be wrong.
IME, doctors don't know a lot about TENS units; they tend to leave that up to physical therapists, but it can't hurt to ask.
I don't know how old your TENS unit is. Mine says don't cross the spine, yet a friend's unit comes with specific instructions & pads
to cross the spine.
There are obviously different units with different features & modalities, and technology moves on. I wouldn't recommend doing anything anyone's unit says not to do; my previous comments were more in the way of future speculation.
Doc