The Injuries Martial Artists Actually Get

Sore is not the same as hurt

Everything below assumes you can tell these apart, so start here. Ordinary training soreness is dull, spread across a muscle rather than sitting on a point, worst a day or two later, better once you move around, and roughly symmetrical. It fades and you forget about it.

The other category announces itself differently. Sharp or hot rather than dull. In one specific place you can put a finger on. Worse the next morning than it was the next hour. A joint rather than a muscle, or swelling, or a new click, or a limb that will not do something it could do last week. Night pain is a flag. Pain that has not improved at all in a couple of weeks is a flag. Anything that changes how you walk is a flag.

None of what follows is a diagnosis or a treatment. It is a map of what is common, so you recognize the thing you have and know when it stopped being your business and became a professional's.

Fingers and thumbs, which the gi eats

If you train in a jacket — jiu-jitsu, judo, anything with lapels and sleeves — your hands take more volume than any other part of you. Grip fighting loads the small joints of the fingers in positions they were never built for, repeatedly, against someone pulling the other way.

What people get is swollen, stiff middle knuckles, sore in the mornings and tight for the first few minutes of every session. Thumbs get it worse, because the base of the thumb takes a sideways load every time a grip is ripped out. Taping is standard in every gi gym on earth and it is doing something real: it limits how far a joint can be forced sideways.

The line: a jammed finger that is swollen and sore is ordinary. A finger that is bent oddly, will not straighten, gave a pop and then went loose, has gone numb, or hurts on the bone rather than the joint wants looking at. Finger injuries get dismissed more than any other, and they are the ones that permanently change a hand.

Ears, and why it is cumulative

Cauliflower ear comes from friction and impact to the outer ear — a head rubbing against a thigh, a shoulder grinding past, a glove catching the rim. The cartilage separates from the skin above it and the space fills with fluid. Repeatedly, over time, the ear reshapes permanently as the tissue hardens.

That word repeatedly is the part people miss. One hard session rarely does it; a few hundred, with the same ear taking the same rub, absolutely does. Headgear in wrestling exists for this, and the reason wrestlers wear it and grapplers often do not is cultural rather than medical.

A hot, swollen, taut, painful ear after training is a medical situation rather than a badge. There is a procedure for it and it belongs to a clinician — ears infect easily and are awkwardly close to things you care about. Whether you mind the look is your call. Whether you let someone in a gym operate on your head is not really a debate.

Skin, which is the most under-discussed risk in the building

This one deserves more attention than it gets, because it is common, it spreads, and unlike most of this list it can affect people who are not you.

Anything with sustained close contact puts your skin against mats and against other people's skin for hours a week, and that transmits fungal, bacterial and viral infections. Most are minor and treatable. Some are not minor at all, and a bacterial skin infection can escalate faster than people expect.

The habits that prevent nearly all of it are dull and non-negotiable:

• Shower immediately after training, not an hour later at home.
• Wash your gi or rash guard after every single session. Not two.
• Do not train in someone else's gear and do not share towels.
• Cover any cut or graze before you step on the mat, and keep it covered.
• Bare feet on the mat, shoes off it. The bathroom floor is how things arrive.
• If a gym's mats are not visibly cleaned, train somewhere else.

And the rule that matters most: if you have an open wound, or a patch of anything new, spreading, crusted, blistered or weeping, you do not train — not reduced, not with a sleeve over it. You stay off until someone qualified has told you it is fine. Training anyway is how one person's rash becomes six people's, and a gym that pressures you back on is telling you something about itself.

Knees

Knees get it from both sides of the sport. In grappling the damage is usually rotational — a knee twisted while the foot is pinned, which is most of what a scramble is — plus the slow grind of a guard player's knees under load. In kicking arts it is more often the pivot and the landing, thousands of them.

The ordinary version is a knee that aches after a hard session and settles. The versions that are not ordinary are specific: a pop or snap at the moment of injury, swelling that comes up fast within hours, a knee that will not take your weight, one that locks so you cannot straighten it, or a feeling of giving way when you turn. Any of those goes to a clinician — and leg locks, where they are trained, are the most efficient way in the sport to produce exactly those symptoms, which is why the tap in a leg entanglement should be early and unembarrassed.

Ribs, shoulders and necks

Ribs are a classic and a misery. They get it from body kicks and body shots, from being stacked, from knees in the clinch, and from someone's weight landing on a chest. Rib pain is sharp and worse when you breathe deeply, cough, laugh or roll over in bed, and there is no way to rest a rib other than to stop moving it. Difficulty breathing, or rib pain after an impact that worsens rather than settles, needs a professional rather than a wait.

Shoulders take it from overhead work, from grip fighting with a straight arm, from being posted on, and from the arm released a beat late. Aching with overhead movement is common. A shoulder that has come out, even momentarily, or one that feels like it might, or an arm that is weak rather than sore, is a medical question — and shoulders that dislocate once tend to want to again.

Necks are the quiet one. Grappling loads the neck constantly: bridging, framing, having a head cranked, hours under someone heavier. Stiffness across the top of the shoulders is the ordinary version. Tingling, numbness, weakness or shooting pain down an arm after neck contact is not ordinary and never was. That is a nerve, and it is not something to sleep off.

Shins, feet, hands and wrists

Striking arts put their damage lower and further out. Shins get bruised and lumpy from pad work and blocked kicks, and the deep bone-level ache after a clash of shins is normal in Muay Thai and brutal the first year. Pain that is pinpoint on the bone and worsening week by week wants a professional opinion rather than more kicking. Feet take it from pivoting barefoot and from jammed toes — discolored toes are routine, a deformed toe is not.

Hands and wrists are boxing's tax. Wrists get bent back on a mistimed punch, knuckles get inflamed from bag work, and the small bones of the hand are easy to break and easy to ignore because you can still make a fist. Wrapping properly and hitting the bag with less ego is the whole prevention program. A hand that is swollen across the back, sore to press on one specific bone, or painful to grip with days later is worth an x-ray and not worth guessing about.

Head contact, which is the exception to everything

Every other category on this page allows you some judgment. This one does not.

A blow to the head can affect the brain without knocking anyone out, without a visible mark, and without symptoms arriving immediately — they can show up hours later, or the next day. And you cannot assess those symptoms in yourself, precisely because the organ doing the assessing is the one that was hit. That is the entire reason this decision gets handed to somebody else.

So the standard is simple and it is not a judgment call: if you have taken a head impact and anything feels off, you are done for the day, and you are seen by a doctor before you spar again. Not after you have decided how bad it was. The culture of shaking it off, finishing the round and getting back in tomorrow is wrong here specifically, and wrong in a way that compounds — a second impact before the first has settled is where the serious outcomes live.

Headgear reduces cuts and does not make sparring safe for a brain. Light sparring is the actual safety equipment. A coach who treats head contact casually is not a tough coach.

What actually keeps you on the mat

Very little of injury prevention is exciting. Tapping early. Taping fingers before they hurt rather than after. Saying "light" at the start of a round and meaning it. Sitting out a week instead of taking six months later. The joints this sport punishes hardest also respond to being moved regularly through their full range, which takes about ten minutes and is covered in mobility that survives a hard week.

And if an injury has already happened, the next step is a physio or a doctor who knows what you do with your week — not a page, and not a training partner with a theory.