There's not a lot one can say to prepare you for this one, beyond the simple advice: Contains Centipedes. Chilopodophobics should be aware that this 1982 offering does have centipedes in it (unlike Tom Six's Human Centipede trilogy of wrongness): close-ups of the little critters running around, scuttling over peoples' faces and bodies. It also has gore, nudity, silliness, terrible dialogue (at least in the subtitles) and a plot that doesn't seem to make a lot of sense, unless I nodded off at a key moment which is admittedly possible. (It's also got one of those Hong Kong soundtracks that seems to have a whole load of other film music randomly dropped into it.)
But Centipede Horror does at least tell me a story I haven't seen before: a young woman in Hong Kong travels to "South East Asia" (the exact country is never specified) against the advice of her businessman brother. On a guided tour she wanders into the woods and is attacked by centipedes: the doctors can't figure out what's wrong with her but her brother discovers it might have something to do with a family curse that started when their grandfather worked out there in the mines, thanks to a wizard casting black magic spells to get his revenge...
Or something. Chief of the horrors is towards the end with what looks unpleasantly like real live centipedes being vomited up by the possessed woman; much of the rest of the film is babbling insanity or tiresome family blather, interest in which is further hindered by poor subtitling (white on white, sometimes nonsensical). It's a little more intriguing and unusual than the more familiar Asian horrors of decades past like Mr Vampire or Encounters Of The Spooky Kind, but it's not really well enough done to be more than a moderately disgusting curio. Hardly surprising perhaps that UK distribution has been somewhat limited,