I'm not sure that epilespy is contraindicated or just "cautioned" for TENS type stim. There are varying opinions. My guess is that there would be feedback from the stim point to the CNS and therefore, brain, and if already prone to seizure, some forms of epilepsy might be more suspectible to be triggered. I can't find any evidence either. I can understand the overall caution--since TENS is used for neck pain and that's a region that's way too close to the brain to be using on epileptics, but limbs, who knows?
The primary concern with electrical stim is that if applied such that there's electrical propagation to the brain that it will trigger something (especially if you're already prone as in epilepsy). No hard evidence, and therefore, it's not recommended unless under medical supervision (whatever that means).
It's kinda like how pregnancy is a contraindication for everything. No evidence, but probably prudent practice if effects on an unborn child are not known. And it's unlikely much evidence is going to be collected since the adverse event would be quite serious--therefore the theoretical risk is high enough to warrant a warning without hard evidence.
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