First Aid for Runners: What Really Matters in an Emergency

Training plans, heart rate zones, fuelling, tapering: runners spend months preparing for a race and have a plan for everything — except the moment something goes wrong for real. A sprain in tree roots, a cramp at kilometre 32, a side stitch ten minutes into the run, a circulatory collapse on an alpine loop. In almost every case the correct action in the first few minutes is simple, and it is rarely the one the reflex suggests. This article covers what actually helps in the five most common emergencies in endurance sport, what you can leave at home — and which warning signs make calling emergency services the only right answer.

Why the first few minutes decide the outcome

The same principle applies to injuries and circulatory events as to training: the dose determines the result. A sprained ankle ligament that you keep loading for another ten minutes before cooling it down will cause problems for days. The same injury, immediately compressed, elevated and unloaded, is often pain-free within a week. The same applies to circulation: lying down five minutes too late becomes a serious matter in summer heat, because the skin is still primed for heat loss with dilated vessels and full blood flow.

There is also a specific feature of endurance sport: most emergencies happen far from any infrastructure. You are on a farm track, in a forest, at kilometre twelve of a race. If you do not want to wait until an ambulance or a race medic arrives, you need two things: the right immediate measure in your head and a minimal kit in your pocket. Everything else can be read up on afterwards — acutely, only the action counts.

The five emergencies that actually happen while running

Emergency medicine in endurance sport is a narrow field. In practice a handful of events dominates, and almost all of them can be identified within seconds:

• Rolling an ankle and spraining it — the most common case of all. A bump, a root, a kerb edge at pace. Typical signs: sudden pain on the outside of the ankle, swelling within minutes, pain on weight bearing.
• Muscle cramps — mostly the calf and hamstring in the final half of a race, in heat, with poor muscular conditioning or insufficient sodium intake.
• Side stitches — harmless but performance-limiting. They occur mainly when pace increases too quickly, especially just after eating.
• Collapse and heat exhaustion — dizziness, cold sweat, weak pulse, in the extreme case loss of consciousness. Every alpine run in summer, every thin layer after an interval session in winter.
• Hypoglycaemia — shaking, sudden hunger, confusion, slurred speech. It affects diabetics first, but also anyone who starts a race on empty glycogen stores and then runs the second half of a marathon.

Everything beyond that — fracture, concussion, chest pain, anaphylaxis after an insect sting — is rare, but every one of those situations belongs in the call-emergency-services category. The distinction is set out further below.

Rolling an ankle: the RICE protocol in practice

The classic running injury, and the only emergency almost every runner has some rule for in their head. RICE — rest, ice, compression, elevation — is still the standard for the first 45 minutes. The decisive point is not to read it as four equal items, but to apply them in the right order and with the right understanding:

• Rest — immediately and completely. The reflex of "just trying a few steps" is the most expensive mistake. After rolling an ankle the ligament structure is stretched or partly torn, and every further foot strike pulls on exactly that spot. Stop immediately, loosen or remove the shoe at a safe spot, and only bear weight again once you can stand without pain and without limping.
• Ice — short, indirect, with pressure. Cooling constricts the vessels and slows the swelling. Cool for 15 to 20 minutes per hour, but never place ice directly on the skin: a thin shirt, a towel or the compression sock in between prevents cold injuries. Cold gel packs carried in your vest work just as well as a mountain stream.
• Compression — the underrated part. Compression works twice over: it limits swelling and reduces pain through mechanoreceptor input. A compression sock, a broad tape or a wrap that encloses the ankle and runs from the toes to above the calf achieves more here than a cold pack alone.
• Elevation — in bed, not sitting. The leg should be above heart level, propped on several cushions. Sitting with the leg hanging down is not elevation, because gravity keeps pulling blood into the foot. If you are heading home, lie flat across the back seat rather than sitting upright.

What does NOT help: warmth in the first 24 to 48 hours, deep-heat ointments, alcohol (it increases bleeding tendency), walking "to loosen it up", and hot baths. From day two, gentle movement and warmth can return once the swelling subsides. If you heard a distinct snap, if major swelling appeared immediately with an inability to bear weight, or if there is tenderness over the outer ankle bone (fibula), a doctor or emergency department should X-ray it — the Ottawa rules exist precisely to avoid missing occult fractures. A related but different problem is persistent foot pain after long-term loading.

Muscle cramps mid-run: what helps immediately

A cramp is an involuntary sustained contraction of the muscle, usually in the calf, hamstring or sole of the foot. The order of immediate measures matters and differs from what many club runners were taught:

• Stop and stretch — in moderation. For a calf cramp: push the heel of the affected leg gently forward, straighten the knee, draw the toes slowly towards you. The reflex is often to force the muscle open, which makes the cramp worse. Stretching here means easing, not tearing.
• Only load the leg once the cramp has released. A cramp that releases after 30 to 60 seconds of stretching leaves a sensitive muscle behind. Walk easily for 2 to 3 minutes afterwards, then test whether a light jog is pain-free.
• Electrolytes, not miracle cures. The much-promoted trick of stopping a cramp instantly with a sour drink works mainly by irritating receptors in the throat, not through its salt content. In practice a good swig of a salty drink is enough. For sessions over two hours, sodium should be in the bottle anyway — otherwise the underlying problem of muscle cramps never even arises.
• Replace sodium afterwards. Too much plain water without sodium on long runs and hot days is not a trick, it is the recipe for cramps and hyponatraemia. Half a teaspoon of salt in 500 millilitres of fluid plus a carbohydrate-rich snack is the pragmatic answer.

If you develop more than two or three cramps in the same session, the cause is usually not electrolytes alone but too large a jump in training load. That is exactly what the acute-to-chronic workload ratio is designed to check — and a plan that does not automatically dampen those jumps is one of the more common flaws in weekly build-ups.

Side stitches: the three measures that genuinely work

Side stitches are unpleasant but harmless — and almost always resolved within minutes. The cause is irritation of the peritoneum and diaphragm through breathing movement with a full stomach or a rapid change of pace. Three measures, in this order:

• Slow down and slow your breathing. Do not stop; ease back into an easy jog and take shorter breaths. A fixed 2:2 rhythm (two steps in, two steps out) stabilises the diaphragm within half a minute. This breathing coordination is also trained systematically in the context of breathing and running performance.
• Apply pressure from outside. Support the affected side with your flat hand from underneath, or press your thumb into the lower rib margin. This gives the diaphragm guidance and, with correct technique, is an immediate pain reliever.
• Straighten up and open the torso. Curling the upper body around a stitch makes it worse. Once the runner straightens and keeps the shoulders back, the abdominal wall stretches and the pain eases for most people straight away.
• Eliminate the triggers. Side stitches are a behaviour problem, not a constitutional one. Too much fluid or food in the two hours before running, starting too fast and a high step rate with shallow breathing are the three most common triggers.

Collapse and heat: the most dangerous situation

Circulatory problems while running are the one story out of these five that can genuinely become life-threatening. The causes differ, the immediate measures are the same: stop the effort, lie down, raise the legs, cool, monitor. Specifically:

• With dizziness, greying vision or cold sweat: sit down at once, lie down better still. Safest is flat on your back in shade or out of the wind, legs raised on a rucksack or water bottle. Do not keep running "until the legs carry again" — that is precisely the mechanism that leads to a genuine syncope.
• Open clothing and apply cooling. In addition to the legs: cool the neck, groin, armpits and wrists, and pour water on your arms, legs and clothing. In summer, evaporation is a more effective cooler than any heat transfer.
• Fluids — but only while fully conscious. Anyone who is responsive and can swallow safely should sip a cold, lightly salted drink slowly. With impaired consciousness or nausea, do not give anything by mouth; place the person in the recovery position instead.

The most dangerous course is not the collapse itself but the struggle to stop. Building heat tolerance and consistent fluid intake through the day is the best prevention, but it does not replace the acute response. In genuine heat stroke — hot dry skin, confusion, core temperature above 40 degrees — only one thing counts: call emergency services and cool in the shade with as much water, ice and airflow as you can find.

Recognising and treating hypoglycaemia

Hypoglycaemia is not limited to type 1 diabetics. On long runs with empty glycogen stores, especially after nothing but coffee before the start, blood glucose can drop in the second half of a session. The signs are clear: shaking, cold sweat, sudden overwhelming fatigue, intense hunger, difficulty concentrating, irritability or slurred speech. Anyone finishing a run in that state describes it almost the same way: "I wasn't thinking clearly any more."

When those signs appear: slow down, sit down, and immediately take 10 to 15 grams of fast-acting sugar (glucose tablets, three or four sugar cubes, half a glass of juice, one energy gel), then wait 15 minutes. Not chocolate, not protein — fat and protein slow absorption. The key is the "15-15" rule: 15 grams, 15 minutes, then reassess. With loss of consciousness, give nothing by mouth and call emergency services immediately; the recovery position is the right response there. In training practice, hypoglycaemia always belongs in the context of carbohydrate management: test your fuelling strategy in training rather than discovering it on race day.

What belongs in your emergency kit — and what does not

A phone number is not a kit. If you run in remote terrain (forest, alpine, trail), carry a minimal set weighing under 200 grams:

• Mini first aid kit: two adhesive strips, one elastic bandage (5 cm), one sterile dressing plaster, a foil emergency blanket, one cold pack, and a card with emergency numbers.
• Communication: a phone — and check that the route has coverage before you run it. Alpine loops with dead spots require someone who knows where you are going and when you intend to be back.
• Electrolytes and sugar, always: for any run over 60 minutes, salt and emergency glucose belong in the vest — not as fuel, but as a reserve for exactly the situations described here.
• What you can leave out: tweezers, splinter kits, disinfectant spray and nasal strips. They cost space and weight and solve none of the five realistic problems. Exceptions: small tweezers for splinters on forest runs, and a tick hook in spring and summer.

When calling emergency services is the right answer

The most common wrong decision in endurance sport is not the wrong measure, it is the hesitation. Emergency services are free, available around the clock and require no diagnosis. What helps the dispatcher: the exact location (GPS coordinates from a map app), what happened, how many people are involved, what injuries are visible and whether the person is responsive. If you do not know the location, give the last known waypoint and stay put until the rescue service calls back.

These situations always warrant an emergency call — regardless of how the runner themselves assesses the situation:

• Loss of consciousness, even briefly, and even if the person becomes responsive again afterwards
• Chest pain, pressure in the chest, radiation into the arm or jaw
• Breathlessness that does not improve within two minutes of rest
• Suspected heat stroke: hot skin, confusion, seizure
• Suspected fracture, head or spinal injury — particularly after a fall with loss of consciousness
• Anaphylactic reaction after an insect sting: swelling of the face or throat, breathing difficulty
• Any time you are unsure — doubt is a reason, not an excuse

Common mistakes in first aid

• "Let me see how it feels when I run." The most expensive mistake with ankle rolls and strains. Loading freshly injured tissue increases the extent of damage; the first 30 minutes decide.
• Ice straight on the skin. Cold injuries are easily possible after 20 minutes of direct skin contact — always keep a layer of fabric in between.
• Heat, ointments, massage in the acute phase. They increase blood flow and therefore exactly what you want to prevent in the first 24 hours.
• Running on with circulatory problems. "I'll be fine" is the shortest route to a genuine syncope in the heat. Sitting down costs three minutes; doing nothing can cost an ambulance.
• Alcohol to calm down or dull pain. It dilates vessels, worsens swelling in injuries and makes any circulatory situation worse.
• No emergency contact and no plan. Anyone running alone should at least have one person who knows the route and the expected return time. That is not an extreme mountaineering concern, it is basic practice for every forest run.
• Running on after injury without clearance. Deciding to take an injury break is not weakness. How to return properly afterwards is covered in the article on injury prevention and the fundamentals of load management.

Frequently asked questions about first aid while running