Knee pain can be frustrating when you are trying to run consistently. One week you might feel fine, then suddenly your knee starts aching during a run, after a run, going downstairs, or when you get up from a chair.
For runners, knee pain is not always caused by one dramatic injury. It can build gradually from training load, muscle weakness, recovery habits, footwear, running surfaces or doing too much too soon. Sometimes it is mild and settles with rest and sensible changes. Other times, it needs proper assessment.
This article is for general information only and should not be taken as medical advice. It is not a diagnosis and should not replace advice from a GP, physiotherapist or qualified healthcare professional. If you have knee pain that is severe, swollen, worsening, linked to an injury, affecting walking, or not improving, seek medical advice.
Why runners often get knee pain
Running is a repeated impact activity. Every step places force through the feet, ankles, knees, hips and trunk. That does not mean running is bad for your knees, but it does mean your body needs time to adapt.
Knee pain often appears when the tissues around the knee are being asked to tolerate more than they are ready for. This might happen when you increase your distance quickly, add hills, run faster than usual, change shoes, move from treadmill to outdoor running, or return after a break.
It can also happen when the knee is doing extra work because other areas are not supporting movement well. Weak hips, tired glutes, tight calves, limited ankle mobility or poor recovery can all change how the knee feels during running.
The important thing is not to panic, but also not to ignore it. Pain is information. It is a signal to reduce load, look at what has changed, and get help if it does not settle.
Runner’s knee
Runner’s knee is a common term often used for pain around or behind the kneecap. The more clinical term is usually patellofemoral pain, although only a qualified professional can confirm what is actually going on.
This type of pain may feel like a dull ache at the front of the knee. It can appear during running, after running, when going up or down stairs, when squatting, or after sitting with the knee bent for a long time.
Runner’s knee is often linked with repeated loading of the joint, training changes, muscle weakness, poor recovery, or movement patterns that place more stress around the kneecap. It is common in newer runners, people increasing their mileage, and runners returning after time off.
What may help depends on the cause, but common starting points include reducing running volume, avoiding painful hills or speed work, allowing recovery time, and gradually strengthening the muscles around the hips, thighs and calves. Pain should not be pushed through in the hope it will simply disappear.
IT band irritation
Pain on the outside of the knee during running is sometimes linked with irritation around the iliotibial band, often shortened to the IT band. The IT band is a thick band of connective tissue running down the outside of the thigh.
Runners may notice this as a sharp, tight or aching feeling on the outer side of the knee. It may come on part-way through a run and ease when stopping. Downhill running, cambered roads, sudden increases in mileage, and repeated long runs can sometimes aggravate it.
It is tempting to try to fix this by aggressively rolling the outside of the thigh, but the issue is often more complex than a “tight band”. Hip strength, glute control, training load, stride pattern and recovery may all play a part.
A sensible approach is to reduce the aggravating running for a while, avoid hills if they make it worse, and consider strength workfor the hips, glutes and legs. If the pain keeps returning, a physiotherapist can assess what is driving it.
Patellar tendon pain
Patellar tendon pain is usually felt at the front of the knee, often just below the kneecap. The patellar tendon helps connect the kneecap to the shinbone and is involved in movements such as running, jumping, climbing stairs and standing up from a chair.
Runners may feel this pain at the start of a run, after a harder session, when going upstairs, or during exercises such as squats and lunges. It may feel more localised than general kneecap ache.
This type of issue can be linked with repeated load, sudden increases in training, hill work, speed work, jumping, or not allowing enough recovery between harder sessions.
Rest alone does not always solve tendon-related problems long term, because tendons usually need gradual, appropriate loading to rebuild tolerance. However, that loading needs to be managed carefully. If you suspect tendon pain, it is worth getting advice from a physiotherapist, especially if it keeps returning or affects daily movement.
Meniscus irritation or injury
The meniscus is cartilage inside the knee that helps with cushioning and stability. Meniscus problems can happen through twisting injuries, sudden awkward movement, or gradual wear and irritation.
A runner might notice pain along the joint line of the knee, swelling, catching, locking, clicking with pain, or a feeling that the knee is not moving normally. Some clicking without pain can be harmless, but painful clicking, locking or giving way should not be ignored.
This is one area where self-diagnosis is not helpful. If the knee locks, gives way, becomes swollen, or you cannot move it properly, seek medical advice. Continuing to run on a knee that feels unstable or mechanically restricted could make things worse.
Ligament sprains
Ligament injuries are more often associated with sudden twists, falls, slips, sports collisions or awkward landings than steady running. However, trail running, uneven paths, kerbs, mud, ice or sudden changes of direction can increase the chance of a knee twist.
A ligament sprain may cause sudden pain, swelling, bruising, instability or a feeling that the knee gave way at the time of injury. Some people hear or feel a pop.
This is not something to run through. If your knee swells quickly, feels unstable, gives way, or you struggle to bear weight, seek medical advice promptly. A proper assessment can help rule out a more serious injury and guide recovery.
General overload and training errors
Not all runner knee pain fits neatly into one injury label. Sometimes the issue is simply that the knee has been overloaded.
This can happen when you increase weekly distance too quickly, add too many hard sessions, run on tired legs, change terrain, start hill work, or combine running with lots of other leg-heavy exercise.
A common example is someone going from two short runs a week to four runs a week, then adding a longer weekend run and a faster session because they feel motivated. Their fitness may improve quickly, but their knees, tendons and supporting tissues may need more time.
This does not mean they are unfit or doing anything wrong. It means the plan may need to slow down. Reducing distance, keeping runs easy, adding rest days, and building strength gradually can make running more sustainable.
Warning signs you should not ignore
Most runners will feel minor aches from time to time, especially when starting out or returning after a break. However, some symptoms need proper attention.
Seek medical advice urgently if you have severe pain, sudden swelling, a hot or very swollen knee, a knee that locks, a knee that gives way, numbness or tingling, fever or feeling unwell with knee pain, or you cannot put weight through the leg.
You should also speak to a GP, physiotherapist or qualified healthcare professional if knee pain does not improve, keeps returning, affects walking, wakes you at night, or stops you doing normal daily activities.
For running-related knee pain, it is sensible to stop running temporarily if running causes pain. If the pain is mild but does not settle after a short period of rest and reduced activity, get it checked rather than guessing.
Should you keep running with knee pain?
This depends on the type, severity and pattern of the pain. As a general rule, do not push through pain that changes your running style, gets worse as you run, causes swelling, feels sharp, or affects walking afterwards.
A mild ache that settles quickly may simply be a sign that you need to reduce your training load. But pain that keeps returning deserves attention.
A useful question is: does running make this better, worse or no different? If it gets worse during the run, causes limping, or feels worse the next day, your body is probably telling you the load is too much right now.
Replacing running temporarily with lower-impact activity may help you maintain fitness while the knee settles. Walking, cycling, swimming or gentle strength work may be options, but only if they do not aggravate symptoms.
Common reasons knee pain starts during a running plan
Knee pain often appears after a change. This is why it helps to look back over the previous two to four weeks.
You may have increased distance, added intervals, changed shoes, started running outside more, added hills, reduced rest days, changed your route, started strength training, or returned after illness or a busy period.
Sleep, stress, nutrition and recovery also matter. A knee that copes well when you are rested may feel more sensitive when you are tired, under-fuelled or doing too much overall.
This does not mean every detail needs to be perfect before you run. It simply means knee pain is often about the total load on your body, not just the run itself.
What can help prevent runner knee pain?
Prevention is not about avoiding all discomfort forever. It is about giving your body a better chance to adapt.
Build your running gradually. Keep most runs comfortable. Avoid adding distance, speed and hills all at once. If you are new to running, run-walk intervals can be a useful way to manage impact while your body adapts.
Strength training can also help. Exercises that build the glutes, hips, thighs, calves and core may improve how your body handles running. This does not need to mean heavy gym training. Simple, progressive home exercises can be enough for many beginners.
Footwear can make a difference too, especially if your shoes are worn out, uncomfortable or not suited to your running. However, shoes are rarely the whole answer. Training load, strength, recovery and running habits usually matter as well.
Helpful strength areas for runners
Runners often focus on the knees because that is where the pain is felt. But the knee sits between the hip and ankle, so support from above and below matters.
The glutes and hips help control the position of the leg when your foot lands. The quadriceps help manage knee movement and absorb force. The hamstrings, calves and feet also contribute to stability and push-off.
Strength work should feel controlled, not punishing. If an exercise causes knee pain, stop and seek advice rather than forcing it. Pain-free strength work can be useful, but painful strength work may irritate the problem further.
A physiotherapist can help you choose exercises that suit your symptoms, running level and goals.
How to return to running after knee pain
Returning too quickly is one of the easiest ways to make knee pain come back. Once symptoms have settled, start with less than you think you can do.
A gentle run-walk session is often more sensible than going straight back to your usual distance. Keep the first few runs easy, flat and short. Avoid hills, intervals and long runs until you know the knee is coping.
Pay attention to how the knee feels during the run, later that day, and the next morning. If symptoms flare, reduce the load again. If it copes well, build gradually.
It can feel frustrating to step back, but a short reset is often better than repeatedly stopping and restarting because the pain keeps returning.
When it is worth seeing a physiotherapist
A physiotherapist can be especially helpful if knee pain keeps returning, affects your confidence, changes your running style, or stops you building consistency.
They can assess strength, mobility, movement patterns, training load and symptoms. They may also help you understand whether the issue is likely to settlewith activity changes or whether it needs further assessment.
This can be reassuring because knee pain can feel confusing. Two people can have pain in a similar place for different reasons. A personalised assessment is much more useful than guessing from symptoms alone.
A realistic way to think about runner knee pain
Knee pain does not automatically mean you have damaged your knees or that running is not for you. It often means something needs adjusting.
That adjustment might be more rest, slower progression, better strength support, different routes, fewer hills, more recovery, or proper clinical advice. For some runners, a small change is enough. For others, a more structured rehab plan is needed.
The key is to listen early. Pain that is dealt with sensibly is usually easier to manage than pain that has been pushed through for weeks.
This article is general information only and should not be used as medical advice. If you are unsure, if symptoms are severe, or if knee pain is not improving, speak to a GP, physiotherapist or qualified healthcare professional.
FAQs
What is the most common knee injury in runners?
One of the most commonly discussed running-related knee problems is runner’s knee, often linked with pain around or behind the kneecap. However, knee pain can have several causes, including tendon irritation, IT band irritation, meniscus issues, ligament injuries or general overload. A healthcare professional can help identify what is actually causing your symptoms.
Is it normal for knees to hurt after running?
Mild temporary discomfort can happen, especially when you are new to running or increasing your training. But knee pain should not be ignored if it is sharp, worsening, swollen, affecting walking, or keeps coming back. If running causes pain, it is sensible to stop and seek advice if symptoms do not settle.
Should I run through knee pain?
You should not run through knee pain that gets worse, changes your running style, causes swelling, feels sharp, or affects daily movement afterwards. Pushing through can sometimes turn a manageable issue into a longer-term problem. Reduce the load and seek medical or physiotherapy advice if needed.
Can weak glutes cause knee pain when running?
Weak or tired glutes can contribute to poor control through the hips and legs, which may increase stress around the knee. They are not the only possible cause, but hip and glute strength is often part of a runner’s injury prevention and recovery plan.
Do I need new running shoes if my knees hurt?
Sometimes shoes can contribute to discomfort, especially if they are worn out or unsuitable. However, knee pain is rarely only about shoes. Training load, strength, recovery, surfaces and running habits may all play a part. If pain continues, get advice rather than relying on shoes alone.
When should I see a doctor about knee pain from running?
Seek medical advice urgently if the pain is severe, the knee is swollen, hot, locked, unstable, or you cannot bear weight. You should also speak to a GP or physiotherapist if knee pain does not improve, keeps returning, or affects walking and daily activities.
Leave a Reply