Knee pain when running after 40 is rarely a sign that your joints are “worn out”. It is usually a load problem: the knee is being asked to absorb more than it is currently ready for, most often as pain around the kneecap (runner’s knee) or on the outside of the knee (IT band pain). The fix is also about load: strengthen your hips and thighs, adjust how much and how you run, and keep running at a level your knee tolerates.
Here is the surprising part. A meta-analysis of over 114,000 people found hip or knee arthritis in 3.5% of recreational runners, compared with 10.2% of non-runners. Running is not what wrecks knees, but running too much, too soon can make them sore.
Key takeaways
- The most common causes of knee pain when running are patellofemoral pain (front of the knee) and iliotibial band syndrome (outside of the knee).
- International experts recommend exercise therapy, and specifically combined hip and knee strengthening, as the main treatment for runner’s knee.
- Raising your step rate by 5–10% cut the energy absorbed at the knee by roughly 20–34% in a lab study of 45 runners.
- Sudden jumps in weekly distance are a likely trigger, but no magic “10% rule” has strong evidence behind it.
- No shoe type has been proven to prevent running injuries. Pick what feels comfortable.
- Swelling, locking, giving way or not being able to bear weight need a professional assessment, not a strengthening plan.
What causes knee pain when running after 40?
Age itself is not the main culprit. What changes after 40 is that you often run on less sleep, carry a bit more body weight, sit more during the week and have less muscle unless you train for it. Then you add a half-marathon plan or a sudden “back to fitness” month, and the knee complains.
Tissues like tendons and cartilage adapt to load more slowly than your heart and lungs do. Your fitness can improve in weeks while your knees need months to catch up. That gap is where most running knee pain starts.
The four usual suspects
- Patellofemoral pain (runner’s knee): a dull ache around or behind the kneecap. Typically worse running downhill, on stairs, squatting, or after sitting for a long time with bent knees.
- Iliotibial band syndrome (ITBS): sharp or burning pain on the outside of the knee. It often starts at a predictable point in a run, gets worse as you go, and is worse downhill. A 2024 systematic review put it at roughly 10% of running injuries.
- Patellar tendon pain: pain just below the kneecap, usually worse with jumping, hills and the first steps of a run.
- Meniscus or arthritis-related pain: pain on the inner or outer joint line, often with swelling, stiffness or a catching feeling. More common after 40 and worth getting assessed.
Self-test: where exactly does your knee hurt?
Take two minutes. Stand up, do five slow half-squats, then walk up and down a flight of stairs. Note where the pain is and what sets it off, then use the table below as a rough guide, not a diagnosis.
| Where it hurts | Typical trigger | Likely cause | First move |
|---|---|---|---|
| Around or behind the kneecap | Stairs, squats, downhill, long sitting | Patellofemoral pain | Hip and knee strength plan, reduce hills |
| Outside of the knee | Same point in every run, downhill | IT band syndrome | Hip abductor strength, shorter runs, step rate |
| Just below the kneecap | Jumping, hills, start of runs | Patellar tendon pain | Slow heavy leg work, fewer hills and jumps |
| Inner or outer joint line, with swelling | Twisting, deep squats, stiffness | Meniscus or arthritis | See a physio or doctor first |
| Any knee, with locking, giving way or heat | Anything | Needs assessment | Stop running, get checked |
What does the evidence say fixes runner’s knee?
In 2016 an international group of patellofemoral pain researchers, led by Kay Crossley, published a consensus statement on treatment. Its clearest message: exercise therapy works, and combining hip and knee exercises beats knee exercises alone for reducing pain and improving function.
A 2018 update found the key recommendations unchanged. Prefabricated foot orthoses were recommended for short-term pain relief. Knee taping and bracing were rated uncertain, and electrophysical treatments such as ultrasound were not recommended.
For IT band pain, a 2024 systematic review found hip abductor strengthening was the most consistent part of successful treatment, usually over 4–8 weeks. Stretching the IT band itself had little support, partly because the band barely lengthens.
In plain terms: the fix happens in the gym and in your training log, not on a massage table. Our strength training after 35 guide shows how to fit lifting around your running week.
The 6-week hip and knee plan for runners
Do this three times a week on non-consecutive days. Each session takes about 25 minutes. Some discomfort is fine if it follows the pain rules further down.
| Exercise | Weeks 1–2 | Weeks 3–4 | Weeks 5–6 |
|---|---|---|---|
| Side-lying hip abduction or banded side steps | 3 × 12 each side | 3 × 15 with band | 3 × 15, heavier band |
| Glute bridge (two legs, then single leg) | 3 × 12 | 3 × 10 single leg | 3 × 12 single leg |
| Wall sit or Spanish squat (knee-friendly depth) | 4 × 30 s | 4 × 45 s | 4 × 45 s, deeper |
| Step-up (low box, slow lower) | 3 × 8 each leg | 3 × 10, hold dumbbells | 3 × 8, higher box |
| Leg press or goblet squat (pain-free range) | 3 × 10 light | 3 × 8 moderate | 4 × 6 heavier |
| Calf raise (straight knee) | 3 × 15 | 3 × 12 single leg | 3 × 12 single leg, weighted |
How to progress it
- Start in a range that feels fine. If deep squats hurt, squat to a box or a higher seat. Our free pain-free exercise swaps tool suggests knee-friendly alternatives.
- Add load, not just reps. Once the last 2 reps of a set feel easy, add a heavier band, dumbbell or plate.
- Go slow on the way down. A 3-second lowering phase on step-ups and squats builds control where runners usually lose it.
- Keep going after the pain settles. Two sessions a week as maintenance helps keep it from coming back.
Should you keep running with knee pain?
Often, yes, with limits. Complete rest weakens the very tissues you want to toughen up, and the pain often returns the day you restart.
A useful framework comes from a randomised trial in Achilles tendon pain. Patients who kept running using a “pain-monitoring model” improved as much as those who rested for six weeks. Many physios apply the same rules to knees:
- Pain during a run stays below 5 out of 10.
- Any flare after running has settled by the next morning.
- Pain and stiffness are not getting worse from week to week.
If you break a rule, cut the next run’s distance or pace, swap a hilly route for a flat one, or replace a run with cycling or swimming. If you break the rules repeatedly, see a physio.
How fast should you build your running?
The famous “10% rule” (never raise weekly distance by more than 10%) is not well supported. A 2018 review found only four relevant studies and called the evidence “very limited”.
Still, the best data point in the same direction. In a study of 874 novice runners with GPS watches, those who increased weekly distance by more than 30% had about 1.6 times the rate of distance-related injuries, including runner’s knee and ITBS, compared with those who increased by under 10%. The result was borderline rather than statistically conclusive.
A sensible approach for runners over 40:
- Increase total weekly distance gradually, and hold it steady for a week every 3–4 weeks.
- Change one thing at a time: distance, speed, hills or surface, not all four.
- Keep most runs easy. Our zone 2 training guide explains how to pace them.
- Plan your paces with the free running pace calculator so easy days stay easy.
Does running cadence affect knee pain?
Yes, and it is one of the cheapest fixes available. In a 2011 lab study, 45 recreational runners ran at their normal step rate and at 5% and 10% above it, at the same speed.
At +5%, the energy absorbed at the knee fell by about 20%. At +10%, it fell by about 34%. Shorter, quicker steps mean you land closer to your body with a less bent knee, which spreads the load.
How to change your cadence
- Check your current steps per minute on your watch during an easy run, or count steps for 30 seconds and double it.
- Aim for 5% more. If you run at 160 steps per minute, try 168.
- Use a metronome app or a playlist at your target beats per minute for a few short sections of each run.
- Keep your speed the same. The goal is shorter steps, not running faster.
- After 2–4 weeks, try 10% if your knee still complains and the new rhythm feels natural.
There is no single “perfect” number like 180 for everyone. Taller runners and slower paces naturally produce lower step rates.
Do running shoes cause or fix knee pain?
Less than shoe marketing suggests. A 2022 Cochrane review found little evidence that any running shoe type prevents lower limb injuries. Choosing shoes by foot shape or “pronation” probably made no difference, based on trials involving more than 7,000 military recruits.
What to do instead:
- Choose the shoe that feels most comfortable when you run, within your budget.
- Avoid big sudden changes, such as switching from a thick cushioned shoe to a minimalist one in a single week.
- Replace shoes when they feel flat or uneven, rather than by a strict mileage number.
- If your runner’s knee flares quickly, simple off-the-shelf insoles may help short term, as the consensus statement found for prefabricated orthoses.
Body weight, sleep and recovery
Every kilo you carry is loaded through your knees with each stride. If you have weight to lose, even a modest reduction lightens that load. Our guide to losing fat while keeping muscle after 35 shows how to do it without losing the strength your knees need. If your knee needs a break from running while you lose weight, our guide to walking vs running for fat loss shows how brisk walking can carry the load.
Recovery matters too. Stack two hard runs back-to-back after a short night of sleep and your knee will usually tell you about it. Spread hard sessions out and keep at least one rest or cross-training day a week.
Safety note: Stop running and get your knee assessed if it is badly swollen or has changed shape, if it locks, gives way or clicks painfully, if you cannot put weight on it, or if it is red, hot and you feel feverish, which can signal infection. The NHS also advises seeing a doctor or physiotherapist if knee pain has not improved after a few weeks. Ask your doctor or pharmacist before using painkillers regularly to keep running.
FAQ
Is it normal for knees to hurt when running after 40?
It is common, but it is not inevitable. Most running knee pain at this age comes from training load and strength, not from age-related damage, and it usually improves with a strength plan and a smarter running schedule.
Should I stop running if my knee hurts?
Not always. If pain during running stays below about 5 out of 10, settles by the next morning and is not getting worse each week, you can usually keep running with reduced distance or hills. Stop and get checked if you have swelling, locking or giving way.
Does running cause knee arthritis?
The evidence suggests recreational running does not. A 2017 meta-analysis found arthritis in 3.5% of recreational runners versus 10.2% of non-runners. Competitive, very high-volume runners had a higher rate, and the studies cannot prove cause and effect.
How long does runner’s knee take to heal?
Many people notice improvement within 4–8 weeks of consistent hip and knee strengthening, but some cases take longer. Keep strengthening after the pain settles to stop it returning.
Should I wear a knee brace or tape for running?
The 2016 consensus could not recommend for or against taping or bracing for runner’s knee because the evidence was uncertain. If a brace makes you feel better, it is reasonable to use it short term while you build strength.
Free tool: plan easy and steady paces with the running pace calculator, and find knee-friendly alternatives to painful exercises with pain-free exercise swaps.
Sources
- Crossley KM et al. 2016 Patellofemoral pain consensus statement, Part 2: recommended physical interventions. Br J Sports Med, 2016.
- Collins NJ et al. 2018 Consensus statement on exercise therapy and physical interventions for patellofemoral pain. Br J Sports Med, 2018.
- Heiderscheit BC et al. Effects of step rate manipulation on joint mechanics during running. Med Sci Sports Exerc, 2011.
- Sanchez-Alvarado A et al. Conservative treatment strategies for iliotibial band syndrome in runners: a systematic review. Front Sports Act Living, 2024.
- Alentorn-Geli E et al. The association of recreational and competitive running with hip and knee osteoarthritis: a systematic review and meta-analysis. J Orthop Sports Phys Ther, 2017.
- Nielsen RO et al. Excessive progression in weekly running distance and risk of running-related injuries. J Orthop Sports Phys Ther, 2014.
- Damsted C et al. Is there evidence for an association between changes in training load and running-related injuries? Int J Sports Phys Ther, 2018.
- Relph N et al. Running shoes for preventing lower limb running injuries in adults. Cochrane Database Syst Rev, 2022.
- Silbernagel KG et al. Continued sports activity, using a pain-monitoring model, during rehabilitation in patients with Achilles tendinopathy. Am J Sports Med, 2007.
- NHS. Knee pain.
This article is for general education and is not medical advice. Check with your doctor before starting a new training or nutrition plan, especially if you have a health condition.
