I'm like a storyteller, that's what I do

Your action hero just got shot in the shoulder, stitched it up in a motel bathroom, and is now running through a forest. I need you to know that a shoulder wound severs muscle, nerves, and sometimes bone, and the human body's response to that is not "mild wincing followed by full range of motion." here is what injuries actually do to peoplee...

⊹ Adrenaline is REAL and it does allow people to do extraordinary things immediately after injury, BUT it is a loan, not a gift. you borrow the function and you pay it back later with interest. Your character might genuinely be able to run for twenty minutes after being stabbed. and then the adrenaline drops and everything the body was delaying arrives all at once. the collapse is NOT weakness. it's biology collecting its debt. write the debt collection. it's more interesting than the heroic sprint anyway.

⊹ Blood loss changes cognition before it drops you. you don't go from "fine" to "unconscious." you go through a whole middle stage of confusion, poor decision-making, emotional dysregulation, a strange calm, tunnel vision, difficulty forming sentences. Your injured character making a bad call, saying something they normally wouldn't, becoming suddenly and inexplicably gentle--that's blood loss. use the middle stage. it's dramatically rich and almost nobody writes it.

⊹ Recovery has a timeline and the timeline is long and boring and inconvenient to plot. a broken rib takes six weeks and during those six weeks sneezing is a genuine emergency. a concussion means no screens, no reading, no bright lights, and symptoms can persist for months. a stab wound to the abdomen means weeks of infection risk, limited mobility, and a specific kind of exhaustion that has nothing to do with sleep. Your character being sidelined and frustrated and useless for a long time is not a narrative problem. it's the story.

- Re: the shoulder injury above - if someone sewed up the skin but didn't reattach nerves, tendons, etc. that were (fully) severed those things still will not work! Look up the anatomy of the area you're injuring and what the things there do

- Even if things aren't fully severed the pain and swelling in an area can make healthy muscles unable to contract as a protective mechanism (ask anyone you know who's had an ACL tear about their quads post injury/surgery). That's why an injured leg "gives out". If the situation is important enough (like your character is running for their life) their brain miiight override that but not necessarily

- Most nerves carry both sensation and motor signals so if you damage a nerve you will likely have numbness/tingling/maybe pain (in specific distributions that you can look up) and also weakness or paralysis of specific muscles depending on the severity of the injury

- Nerves take for freaking ever to heal (axons regenerate at ~1mm per day or ~1 inch per month) and sometimes they just don't (especially if they're fully severed and not surgically reattached)

- For most common injuries you can look up healing timelines but be careful with what endpoint you're looking at - for example you might be back to ADLs (activities of daily living like walking, dressing, maybe cooking and cleaning) in as little as a week but that doesn't mean you're back to running or sports or fighting bad guys

- Also with timelines there's a limit to how much you can push them. Like yes a pro athlete (or spy or superhero or whatever) might be pushed to go back "too soon" but if you're cutting 3 months off of a 4 month recovery timeline either they're 100% going to get reinjured because the tissue isn't healed yet or they're straight up like not even walking yet

- Pain, especially chronic pain, is super complex and interesting, and so often misunderstood or misrepresented (in medicine, not just in writing). If your source for how chronic pain works is more than ~5 years old it's probably wrong. There almost always BOTH physiological/biological factors and psychosocial factors in chronic pain and reducing it to just one or the other is both probably wrong and also likely not as interesting to your story - for a while we kind of thought it was all biological and then the pendulum swung to it being all psychological but it probably is both for most people

- A note / expansion on the above point about adrenaline: the phenomenon described is totally accurate but it's not just because of adrenaline. Pain is at its core an alarm system that your brain/nervous system uses to protect you. So if the most dangerous thing for you right now is the bear chasing you, it might not produce a pain experience to alert you about your broken leg, but once the bear is gone the broken leg is now the most important thing and your brain will make sure you're in enough pain that it's your top priority

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