The only things I ask anyone to tag are images or descriptions of needles or other medical procedures. I don't block these as I'm actively trying to desensitize myself, but unexpected exposure to them has caused me to faint in the past. Particularly images, but I have passed out listening to descriptions of painful injuries as well. I'm improving a lot (I haven't fainted in a while) so I probably am ok without the tag but tagging these things is better than not tagging.