Tens machines are clinically proven, and I use one for chronic knee joint pain, both knee's, but I'm not convinced it helps with pain directly.
The worst thing about chronic pain, isn't the actual pain, which isn't nice, I get more acute pain with certain movements and too much moving but I get a general dull ache like 90% of the time. Its just, tiring, always feeling pain, every part of your life involving pain, the decision to go buy food even from a close by shop dependant on your pain, chronic pain is just a constant nag you can't get away from. Now tens machines, I don't know if theres anything that stops the pain or lessens it, some suggests it does and that certain modes can release endorphins, maybe, maybe not. I think the main thing is simply giving your nerves a DIFFERENT message rather than the same message.
That it clinically and scientifcally can do, theres no question that put on the pads, turn it up, you won't feel it. I'd say its certainly not alternative, but its no opiod replacement either
A lot of "alternative therapys" are complete tosh, a lot are maybe not proven, as most medical idea's can seem out there at first. A lot of things like herbs for this that or the other condition, some work as a placebo, some just work, some are nonsense. A huge number of medicines we take were based off real herbs found here there and everywhere, so its nonsense to right all treatments as a joke, as lots of old remedies end up the basis for real clinically proven synthetically produced variants of the same things.
The worst thing about alternative medicines, is the internet, for pretty much ANYTHING, anything you can buy at all, for medicine, or for your computer, or for anything you can think of there is SO much disinformation, deluded individuals praising the effectiveness of some new idea that its literally impossible to know whats crackpot and whats more realistic these days, thats why a lot more people get caught in the borderline believable things.
THe worst thing is, theres very little to disgtinguish between a product that works and has genuine reviews, a product that works and has people who sell competiting products who post reviews saying its rubbish, but product X really works, those who have products that do nothing and are filled with fake reviews, and those products that don't work but deluded people think works and tell everyone how good it is.
With the internet these days theres TOO much information and so much from completely unverifiable sources, that the crackpot alternative stuff, and the semi effective things that actually work are indistinguishable.
I can see why a lot of people try homeopathic remedies, as people like the idea of natural stuff, people pump out websites crying out about how every single different chemical is terrible for you and anything natural is somehow healthy, kind of like the Dihydrogen monoxide hoax stuff, but with just about any chemical added to any food, medicine, clothes dyes, theres websites out there claiming they cause anything from a cold to every form of cancer ever found.
When people look up the problems they have, they tend to scare themselves with the real treatments more than find answers they need, hence the huge push towards alternative medicine, and the simply huge industry its become.