In this questionnaire, patients are being asked about different types of physical discomfort they might have experienced. Itching is "klåda" and "kli" is scratching. It seems redundant to me. Perhaps you could ask the author if the tingling sensation often subsumed under paresthesia (as an example, the sensation when your leg or arm "falls asleep") could be "kli" in this questionnaire. Usually that should be "pirra", but since we have "klåda" and "kli" right next to each other, this seems to make better sense, both linguistically and medically. Otherwise one might simply have to merge the two words "klåda" and "kli" into itching.

I think I would say itch or itching or itchiness for klåda and irritation for kli. This is based on a sense that klåda is a longer lasting state of itchiness than kli, which feels like something that is more of a sudden, temporary irritation. Perhaps.