If your knee hurts when you walk, especially after 40, it is often due to how the joint is loaded rather than something suddenly “wearing out” overnight. Common causes include patellofemoral pain (pain around the kneecap) and early osteoarthritis. The good news: with sensible load management, targeted strength work, and the right physiotherapy support, many people can continue to walk comfortably and protect their knees for the long term.
Why does my knee hurt when I walk?
Walking is one of the best forms of exercise, especially as we get older. It is social, gentle on the body, and ideal if you enjoy getting outside with friends, family or the dog. So when every step starts to hurt, it can feel both frustrating and worrying.
Your knee works hard with every stride. It has to manage your body weight, uneven ground, hills, changes in speed, and often a lifetime of habits in how you walk. Over time, small changes in how your muscles work or how your joints move can add up and create irritation and pain.
For many people over 40, knee pain when walking is most often due to:
- Patellofemoral pain (pain around or behind the kneecap)
- Early osteoarthritis (the “wear and repair” changes in the joint)
- A combination of both
Common causes of knee pain when walking after 40
1. Patellofemoral pain – discomfort around the kneecap
Patellofemoral pain affects the joint between your kneecap (patella) and the groove it sits in at the front of your thigh bone. Pain is often felt:
- At the front of the knee
- Around or behind the kneecap
- When walking up or down hills or stairs
- When getting up from a chair or after sitting for a while
Walking increases the load on this part of the knee, especially on slopes or when you lengthen your stride. If the muscles around your hip and knee are not sharing the work evenly, the kneecap can become irritated.
You might notice:
- A dull ache rather than sharp stabbing pain
- Clicking or crunching sounds that are more annoying than painful
- Symptoms that ease once you “warm up” but return later or the next day
2. Early osteoarthritis – “wear and repair”, not just “wear and tear”
Osteoarthritis (OA) is one of the most common joint conditions in adults over 45 in the UK, with the knee being a frequent site. It involves gradual changes to the cartilage, bone, and surrounding tissues inside the joint. Contrary to popular belief, movement like walking, when well-managed, is usually helpful for joint health.
With early knee OA you might notice:
- Stiffness when you first get going in the morning or after sitting
- A feeling of “grinding” or “roughness” deep in the joint
- Pain that appears after longer or faster walks
- Swelling or a feeling that the knee is puffy or full
These changes do not automatically mean you are heading for a knee replacement. Many people with these findings on scans have little or no pain. The key is how the joint is loaded and how strong and supported it is.
3. Other possible contributors
While patellofemoral pain and early osteoarthritis are very common, other factors can also play a part, such as:
- Previous injuries (sprains, meniscal tears, ligament problems)
- Muscle weakness in the hips, thighs or calves
- Stiffness in the hips, ankles or lower back changing how you walk
- A sudden change in walking habits (new dog, longer walks, new walking group)
A thorough assessment by a physiotherapist can help clarify which of these are relevant for you and guide a personalised plan.
Why walking can feel fine one day and awful the next
If you live for your daily walk, this pattern might sound familiar:
- One day your knee feels manageable
- The next day, after an extra hill or a longer route, it aches badly
- You rest for a bit, feel better, then it flares again when you try to resume
This often comes down to your knee’s capacity versus the load placed on it.
- Capacity is what your joint and muscles can comfortably tolerate at the moment
- Load is how much you ask of them – distance, speed, hills, uneven terrain, carrying bags, even the dog pulling on the lead
Pain tends to appear when the load regularly exceeds the current capacity of your knee. The solution is rarely to stop walking altogether, but to temporarily rebalance the two while you work on improving capacity with targeted strengthening.
What you can do right now
Adjusting your walking “load”
Completely stopping walking can actually make your knee stiffer and weaker. Instead, focus on adjusting how you walk so your knee can cope better.
You might consider, for a short period:
- Reducing distance slightly but walking more frequently
- Choosing flatter routes and avoiding steep hills or long descents
- Breaking longer walks into shorter, spaced-out outings
- Using well-cushioned, supportive footwear appropriate for your terrain
Aim for a level of walking that causes mild discomfort at worst, but that settles within 24 hours. If pain is severe during or after every walk, or lingers for several days, the load is probably too high for now.
Simple strength work to support your knees
Stronger muscles help share the load and protect the joint. This is especially important for the quadriceps (front of thigh), gluteal muscles (hips), and calves.
A physiotherapist can show you the right level for your knee, but examples of helpful movements often include:
- Sit-to-stand practice: controlled stands from a chair, using your legs more than your arms
- Supported mini-squats: gentle bending and straightening of the knees while holding on for balance
- Step-ups: small controlled step-ups onto a low step or stair
- Hip strengthening: exercises lying on your side or standing with support to target the outer hip muscles
The goal is not to “hammer” your knees, but to build strength gradually so that your everyday walks feel easier and better supported. Consistency, rather than intensity, makes the biggest difference.
Helpful day-to-day habits
Small changes can reduce irritation and give your knee a chance to settle:
- Vary your position if you sit for long periods – avoid getting “stuck” in one posture
- Take short movement breaks during the day to stop stiffness building
- Avoid suddenly doubling your step count or adding very long walks at weekends only
- Use ice or gentle heat for short periods if it feels soothing for your knee
If symptoms persist, it is sensible to get tailored advice rather than relying on general tips alone.
How physiotherapy can help protect your knees
Physiotherapy is not just about treating pain in the short term – it is also about improving how your joints work so you can keep moving confidently in the long term. At Thorpes Physiotherapy, we see knee pain from walking every day and understand how worrying it can feel when walking is your main form of exercise and social connection.
A physiotherapy assessment for knee pain will typically include:
- A detailed history of your walking routine, lifestyle and goals
- Movement and strength testing for your hips, knees, ankles and lower back
- Observation of how you walk, including stride length and how you manage hills
- Identification of whether your symptoms are more in keeping with patellofemoral pain, early osteoarthritis, or something else
Based on this, your physiotherapist can then:
- Design a structured, progressive strengthening programme tailored to your knee
- Help you plan safe walking distances and routes while you build capacity
- Use hands-on treatments where appropriate to reduce pain and stiffness
- Offer guidance on advanced therapies or joint support options if these are suitable for you
Many people are surprised at how much more comfortable walking can become once their exercises, walking plan, and joint care are aligned.
When should I seek help about knee pain?
You should seek professional advice promptly if you notice:
- A sudden, severe swelling of the knee after a minor event
- Your knee giving way repeatedly, or locking in one position
- Significant redness, warmth, or fever alongside knee pain
- A history of inflammatory conditions with a new flare of knee symptoms
Even without these features, it is sensible to get your knee checked if:
- Pain has lasted more than a few weeks
- You have already cut down or stopped walking because of symptoms
- You are worrying about ending up like an older relative who had severe joint problems or a replacement
Getting clear, early guidance can reduce worry and help you make better decisions about activity, rather than guessing or avoiding movement altogether.
Worried about your walking future? Thorpes Physiotherapy can help
If knee pain is making you question your enjoyment of walking, you do not have to wait for it to become “bad enough” for surgery. Many people can improve their symptoms and confidence with a clear plan, structured rehabilitation, and the right level of support.
If you are unsure whether physiotherapy is right for you, you can arrange a https://thorpesphysiotherapy.com/free-discovery-visit/ to talk things through in a relaxed, no-pressure setting. If you already know you want our help, you can call the clinic on 01276 37670 to book an initial evaluation and start working towards more comfortable walking.
If you feel ready though, to book in for a Physiotherapy assessment and to start treatment or get an exercise plan in place, click the icon below to book online
I hope this has been interesting and of value to you.
Warm regards
Jonathan Smith (MSc BSc FSOMM MCSP SRP)
Director of Thorpes Physiotherapy