I've had dengue fever. There are a few different strains and I had one of the milder ones but it was still enough to put me in the hospital for dehydration as an otherwise healthy 20yo.<p>In Thai it's known as hemorrhagic fever, but unlike in English, where "hemorrhagic" is a technical term where the meaning isn't clear or is softened, in Thai it's just three simple Thai words: ไข้เลือดออก, "fever [that makes] blood [come] out". Luckily I didn't have any hemorrhaging.