You run — and your knees hurt? You’re not alone. Knee pain is the most common fear among beginners and the main argument against running from “those who tried”.
But pain is not a verdict. It’s a signal that you can read, understand and — if you act wisely — eliminate.
In this long read we’ll break down:
- Why knee pain appears
- What the causes are (and which ones are dangerous)
- What to do to avoid injury
- How to run safely, even if you have “weak joints”
🧠 Why do knees hurt specifically while running?
During running, the load on the knee is 3–5 times higher than body weight. This happens with every step: landing, force transfer, push-off.
If the muscles are not ready, technique is off, and volume increases sharply, the knee joint starts to suffer. It doesn’t “go bad” on its own — it gets overloaded.
Pain = overload + lack of readiness
Important: movement itself is not harmful. Moreover, regular loading nourishes the joint: movement produces synovial fluid and improves cartilage nutrition.
But if you run “on bone”, without preparation, with overstrained muscles — pain is inevitable.
⚠️ Common causes of knee pain in runners
Here are the top common sources of pain — with explanations.
1. ITBS — pain on the outside of the knee (iliotibial band syndrome)
What it is:
ITBS (iliotibial band syndrome) is one of the most common running pains, especially in those who suddenly increase volume or run on hilly terrain.
📌 The iliotibial band (ITB) is a wide, dense “band” of tendon that runs from the hip to the outer side of the knee. It helps stabilize the leg during movement, especially during landing and stance.
When it becomes tight or irritated, it literally starts to rub against the outer part of the knee joint, causing inflammation and pain.
Where it hurts:
- On the outside of the knee, very locally
- It can sometimes feel like the pain “clicks” or “pulls” along the outer ligament
- It can radiate up into the thigh
When it appears:
- After 3–5 km of running (typical)
- During long descents
- With repeated loops of the same distance, especially without a cool‑down
- Often worse the day after a long run
Why it occurs:
- Overstrain or shortening of the IT band
- Weak glute muscles → poor pelvic control
- Poor technique: knee collapsing inward
- Sudden increase in training load, especially on uneven terrain
💡 What to do:
Review your load:
- Take a 3–5 day break from running
- Cut out hills and descents
Strengthen stabilizers:
- Glute bridge
- Monster walks
- Side planks
- Balance work
Stretching and mobility:
- IT band and quadriceps stretches
- Foam rolling along the outer thigh
- Releasing tension in the tensor fasciae latae (hip area)
📌 Important: pain with ITBS is not “inside the knee”. The joint itself is intact. The pain is tension and friction of the band, which is solved by better control and stretching, not by months of rest.
2. “Runner’s knee” (PFPS — patellofemoral pain syndrome)
Where it hurts: Pain is felt around or under the kneecap (patella), often diffuse. It may feel deep or “behind the knee”. Sometimes dull and aching, sometimes sharp under load.
Why it occurs: PFPS is associated with incorrect patellar tracking along the groove of the femur. Causes may include:
- Weak quadriceps, especially the medial part (vastus medialis)
- Weak or inactive glutes and hip external rotators
- Hypermobility of the foot (for example, due to overpronation)
- Strength–mobility imbalance in the leg
- Training load errors (too sharp an increase in volume)
- Running downhill without control
When it hurts:
- On downhills (more than on uphills)
- With prolonged sitting — especially with bent knees (“cinema sign”)
- During squats, lunges, stair climbing
💡 What to do:
Reduce load:
- Cut down running volume and intensity for 1–2 weeks
- Avoid downhills and stairs
- Cut out squats and jumps until it improves
Strengthening:
- Work on your quadriceps — especially with an emphasis on VMO (for example, wall sits with a ball between the knees)
- Add glute bridges, side leg raises, side steps with a band
- Strengthen hip external rotators (clam shells, monster walks)
Technique control:
- Make sure your knee doesn’t collapse inward while running, jumping or squatting
- Use slow‑motion video analysis or a coach’s help
Symptomatic:
- Ice after running if pain persists
- Massage of the quadriceps and the lateral thigh
📌 Important: PFPS is not a “lesion” but a functional malfunction. You can work on it and return to running if you adjust load and exercises correctly.
It is not cured by rest, only by active rehab.
3. Poor technique and overstriding
What this even is:
Overstriding is a mistake where the foot lands too far in front of the body, on an almost straight knee. It often goes along with heel striking and a feeling of “braking” with every step.
📌 Visually it looks like “stepping over yourself” — the step is long and the body is constantly catching up with the stance leg.
Where it hurts:
- Most often the front of the knee suffers — due to increased load on the patella
- The lower back, pelvis, shins can also hurt — due to changed shock distribution
- Sometimes “weird” pains without a clear injury appear, just from accumulated tension
Why it occurs:
- The instinct to “lengthen the stride”, especially when speeding up
- Trying to “bounce” instead of run
- Lack of core and posture control
- Low cadence (step frequency) — the lower it is, the higher the risk of overstriding
- Subconsciously copying someone else’s technique (especially tall runners)
When it shows up:
- When increasing pace (“I switch to fifth gear — and start reaching forward with my leg”)
- On long runs, when technique “falls apart” from fatigue
- On asphalt, where each impact resonates stronger
- When trying “to look pretty” — long and smooth
💡 What to do:
Awareness + video analysis:
- Film yourself from the side (or ask a friend)
- Check: the foot should land under the knee, not in front of it
Stride adjustment:
- Shorten your stride
- Raise your cadence to 170–180 steps per minute
- You can use a metronome (Strava, Garmin, NRC have built‑in ones)
Strengthen stabilizers:
- Core (abs, obliques, lower back) — the “pendulum” that keeps you from collapsing
- Glutes — stabilize the thigh, stop the leg from “shooting forward”
Drills:
- Drill “high‑cadence running in place”
- Drill “short stride with a lean” (slight forward lean — and the steps shorten by themselves)
📌 The point: overstriding is not about leg length. It’s a coordination issue between body and foot. When you shorten your stride and keep the rhythm, impact decreases, load comes off the knee, and running becomes smooth and safe.
4. Load increasing too fast
Where it hurts: unpredictable — depends on your individual weak spots Why: you started running too much and too often When: pain appears by the end of the week and persists the next day
💡 What to do: follow the +10% rule (don’t increase volume by more than 10% per week)
5. Wrong shoes or worn‑out trainers
Where it hurts: the knee “protests” with no obvious reason Why: poor cushioning or incorrect foot support When: especially on hard surfaces
💡 What to do: choose shoes for your foot type, replace your trainers every 500–700 km
🩺 When you should see a doctor
Not every pain is an alarm signal. But there are situations where self‑treatment is not an option:
- Pain doesn’t go away at rest
- There is swelling, clicks, instability
- You can’t bend/straighten your leg
- Pain increases over time
📌 In such cases — see a trauma or sports doctor. Better to play it safe.
🧘♂️ How to reduce knee load and run pain‑free
Here are practical steps that help most beginners.
1. Warm‑up is non‑negotiable
A simple dynamic routine for 5–7 minutes:
- Hip and knee circles
- Lunges with torso rotation
- Calf raises
- Easy running in place
This activates joints, muscles, ligaments — and cuts injury risk drastically.
2. Watch your technique
- Don’t lean back
- Don’t “throw” your leg far forward
- Land softly, closer to your center of mass
- Cadence — from 165 and up
If you can, record side‑view video. Sometimes just seeing yourself is enough to realize: your technique is “breaking” your knees.
3. Build your stabilizer muscles
The knee doesn’t “hang in the air” — it’s held by the thigh, glutes and core. Without a stable base, the joint takes the hit.
Exercises 2–3 times per week:
- Glute bridge
- Squats with a band
- Side lunges
- High plank
- Single‑leg balance
4. Don’t be a hero. Gradual progress is key
A classic: you start running → a week later it’s 5 × 5 km → knees start screaming. Because the muscles didn’t have time to adapt. Running is an impact load, not swimming. Your body needs preparation.
Rule: increase load by no more than 10% per week. And if something hurts — rest, don’t make it worse.
📉 What to do if your knees already hurt?
-
Stop
Don’t “run it off — it will pass”. It won’t. Give your body a signal: you hear the pain.
-
Cooling (first 24 hours)
Ice for 10–15 minutes through a cloth, 2–3 times a day
-
Gentle movement
Walking, stretching, exercises without loading the painful area
-
Analyze the cause
— Did you run too long? — Did you sharply increase volume? — Did you run on hard surfaces? — New shoes? — When was your last warm‑up?
-
Return to running gradually
After rest — a short 1–2 km easy run. If the pain doesn’t return, increase cautiously.
✅ Short checklist: how to run without making your knees suffer
- Do a warm‑up before every run
- Increase volume slowly
- Don’t chase pace — run comfortably
- Watch your technique: landing, stride, torso
- Strengthen thigh and core muscles
- Replace shoes on time
- Don’t run through pain — that’s not training, that’s harm
🎯 And most importantly — knees don’t “break from running”
Knees suffer not from running itself, but from:
- a bad start
- poor preparation
- lack of attention to your body
If you do everything gradually and treat your body with respect, running doesn’t destroy but instead strengthens your joints.
🚀 Bonus: start with short online races
If you want to give your body time to adapt, start with short online races on URX. – 1–3 km per week – no stress, no crowded start line – with a medal at the finish — and the feeling: “I run. And I’m doing it right.”
Running is a skill. And your knees won’t let you down if you don’t let them down.