Lol, talk about coincidences.. you're literally talking to a guy who hasn't eaten fiber for two and a half years.. carnivore ftw
Yes, sure, exactly... the remedies produce a solution to a challenge, the injuries Are the challenge... except they're not really challenging and the remedies are basically the same, "loot a couple med boxes". Improvements could be made..
How would I make some of these more interesting? Well, I'll draft something on the spot.. (poor quality warning)
Laceration... doesn't drop your max health, but makes you bleed sporadically on it's own. Quite often even, so you might even need to pull down curtains from your environment to control the bleed. This would "color" your environment a little different, you want to know where the cloth is. Make the suture kit calm it down to what it is now; getting hit will cause bleeds with the high chance of tearing you stitches and putting you back to square one. Duration couple hours without sutures, half an hour with.
Bleeds.. let them bleed. Slow loss of life, but at least a couple minutes long without bandages. Gives a nice sense of urgency since you know you'll have to deal with it; note that cloth is essentially everywhere, you'll just need to grab it. This means you'll really want to stitch that laceration.
Scrapes... they lower your max health, one of these might be useful .. but I would make this the one that you can instantly heal.. it's not a bleeder, and if you cover the scratches with cloth and antibacterials, you're pretty much golden. Unless you want to go for a "swapping bandages" mechanic, but that seems a little overkill.
Concussion.. I'm not even sure what it actually does, I could check, but .. ehh. Make it blur your vision sporadically, dependent on your stamina state.. the lower the stamina, the blacker it goes and the longer it lasts. (You know you're not supposed to strain yourself with head trauma) Making it cause trouble navigating and fighting. The effect goes away temporarily with pain killers, but the debuff doesn't. Getting hit has an increased chance of stunning you whether or not medicated.
- side note, make driving into a tree on a motorized two-wheeler actually hurt ...
Fatigue .. why is this a combat injury? Tighten the screws a lot on the food supply, make being hungry cause increasing fatigue over time.. needing some Real Good foods to slowly recover. Vitamins help, maybe a lot, maybe just temporarily. Yes, you may be starving all the time, but you don't have to make it completely debilitating; being well fed would then be a buff for the early game until the inevitable overabundance kicks in.
Sprains .. they're all right as is, could use a little love, but we can't choose to use "the other hand" for the blade for obvious reasons.
Broken bones, might copy the idea from earlier.. make it fall-only, require a cast and a friendly NPC to set, and require a crutch to move decently for couple game days. Maybe maybe maybe you can inflict one on the second-to-last hit to land (as in, on any hit that would kill you if doubled in effect).
That's not a huge improvement on anything, but might demand your attention and affect your game play in reasonable ways...