#he doesn't get that anymore because hes properly hooked up now but jfc that man treated 'entering the death zone' like it was

[givemewallywestorgivemedeath]

okay weird q incoming but what ways do you think speedsters can get sick? Like to my understanding, they can’t really come down with normal virus’ like the flu, right? But they could get things like chronic migraines?

NANOBOTS!!! This is one of the best pieces of canon lore ever. I did a whole post on it but TLDR: normal human metabolisms have so much shit going on that they don't even notice nanobots in their body BUT speedsters have hyper accelerated metabolisms that are the equivalent of the straight A's overachiever in school on meth. So speedster metabolisms do notice nanobots and they attack full force, triggering all of the body's defenses and responses.

But the nanobots are metal so it obviously doesn't do anything. It just leaves the speedster lethargic, feverish, vomiting, dizzy, with a headache, sore muscles and a runny nose, ect. It's basically an allergic reaction.

Now, poisoning them can work depending on what the poison is/what the dosage is. You would need a 100% fatal poison and you would need a fairly high dose. Because speedsters heal fast and they have a hyper accelerated metabolism, so any poison that is based on toxicity (alcohol poisoning for example) would be out of their system faster than it could even take effect.

But poisons that can't be cleared out/processed by the body (take cyanide for example, it binds with the chemical receptors in your body making it physically impossible to use oxygen) wouldn't really be affected by their metabolism at all. So while the speedsters could heal the damaged tissues from these poisons fairly quickly (making it seem as though they were only slightly affected) they would ultimately need time to do so, time they would not have if it kills them first. This isn't technically what you are asking because there would be no substance that 'makes them sick', there would only be 'fine', 'not fine for like a minute and then fine again' and 'dead'. (... unless they were hooked up to a steady supply of the toxin)

Likewise, (this is getting more into theoretical territory, less canon) there might be some illnesses that would affect them? Not for long but if you got something super fucking fatal like Rabies, it might make them display mild cold symptoms for a day or something.

I don't know though. They have really fucking good immune systems. And even super fatal diseases can be fought. Take my example of Rabies, while it is commonly thought to be 100% fatal once symptoms show up there actually have been cases of people surviving it. Rabies is a very stealthy and fast disease, so the main problem with treating it is that your body's immune system isn't fast enough to stop it. People have survived by being placed in medically induced comas (slowing their bodily functions and thus the disease) for long enough that the medication can eradicate it. So for a speedster? That's gone in a minute tops. You would need an insane disease that I'm not sure even exists.

There's also like... pregnancy and menstruation. Growing pains, muscle pain from running is a BIG ONE, being dehydrated/starvation, blood loss, ect. Lots of ways to fuck with a speedster in a way they can't immediately fix.

There are also speedster specific ailments. It's basically 50/50 if a natural born speedster gets a weird highly fatal aging disease. Sometimes speedsters can be born without a kinetic energy shield which makes using their powers at all incredibly fatal to them. All speedsters will have connectivity issues at some point that can be fatal. Sometimes Time Gets Bad™ (shout out to when Barry kept chronically stealing time from people/things every time he used his powers). Sometimes they have too much energy and can't maintain human form (shout out to when Wally didn't know what the speedforce was and was accidentally cosplaying Ghost Rider). Velocity 9 is a highly addictive drug that works on speedsters and makes them display typical addiction behavior (and withdrawal). V9 can also cause a speedster to 'overdose' (burst into flames/lightning/energy). They all have the constant urge to yeet themselves into the speedforce. Ect.

#here's the thing: they are made of speedforce but its not a skin deep thing. you feel me? like their CELLS are made of speedforce #so all shit still affects them #i keep saying that they don't need oxygen or food to survive and thats true but its only if they're actively compensating with speedforce #cause they can get energy from the speedforce or they can get energy from oxygen and food or both. they can't do neither #and they don't really *know* or understand that theyd be fine with JUST speedforce energy. they still think they need oxygen and food #so if they were suffocating or something they might instinctively crank up the speedforce to compensate but they're also very stupid #so they might just die. idk it really depends on who it is how much they know and how much SF they're drawing on #cause like... energy beings need energy yo #i hope this makes sense #the muscle pain one is interesting cause Wallys early runs are really big on the whole hitting the wall thing #he would hit a wall that he physically couldn't break through and it caused him a lot of pain. #some of that was not being hooked up properly cause Wally wasn't hooked up properly until he was an ADULT #because he is FUCKING INSANE and he just went 'huh i guess this is my limit and i will stay below it' liKE AN INSANE PERSON #anyway some of it was SF issues and some of it was mental but he actually got really really hurt anytime he got close to the wall #REALLY bad muscle pain. and like... it was potentially extremely fatal. 'breaking down your body into little bits' fatal #he doesn't get that anymore because hes properly hooked up now but jfc that man treated 'entering the death zone' like it was #the high score to beat at his local arcade. he took it as a fucking challenge. absolutely insane dude right there