A knee can feel fine on a walk, then complain sharply on the stairs. It may ache after a run, stiffen after a long drive, or make squatting feel unreliable. If you are asking, why does my knee hurt, the answer is rarely just “getting older” or “overdoing it.” Knee pain often reflects a change in how the joint, muscles, tendons, or surrounding tissues are handling load.
The knee is built to move, bend, absorb force, and transfer power between the hip and ankle. When strength, mobility, training volume, footwear, work demands, or an injury changes that system, pain can appear. The location, timing, and behaviour of your symptoms provide useful clues, but a proper assessment is the best way to identify what is driving your pain and create a plan for lasting recovery.
Why Does My Knee Hurt? The Pattern Matters
Pain at the front of the knee is different from pain along the joint line, behind the knee, or directly below the kneecap. Equally telling is what brings it on. Pain while going downstairs, for example, often involves a different loading pattern than pain when twisting, kneeling at work, or getting up after sitting.
A physiotherapist looks beyond the painful area. Limited hip strength, reduced ankle mobility, poor single-leg control, a sudden increase in activity, or an altered walking pattern can all increase stress at the knee. This does not mean the knee is not the source of your symptoms. It means effective treatment often needs to address the whole movement system rather than only the sore spot.
Pain around or behind the kneecap
Patellofemoral pain syndrome, sometimes called runner’s knee, is a common reason for discomfort at the front of the knee. It can feel like a dull ache behind or around the kneecap and may worsen with stairs, squats, running, lunges, or prolonged sitting with the knee bent.
This problem is not limited to runners. It can affect people returning to exercise, workers who climb stairs or squat frequently, and anyone whose activity level has changed quickly. Treatment usually focuses on managing aggravating activities temporarily, then rebuilding quadriceps, hip, and calf strength while improving how the leg controls load.
Pain below the kneecap
Pain at the tendon just below the kneecap may point to patellar tendinopathy. It is often linked to repeated jumping, sprinting, sudden acceleration, or high-volume training. Early on, it may hurt during activity but settle afterward. As symptoms progress, daily tasks such as stairs or standing from a chair can become uncomfortable.
Tendon recovery is usually not about complete rest. Tendons respond well to the right amount of progressive loading, but the amount and pace need to match your current tolerance. Pushing through severe pain can prolong symptoms, while avoiding all movement can reduce strength and capacity.
Pain on the inside or outside of the knee
Pain on the inner side of the knee may involve the medial collateral ligament, a meniscus, irritation from osteoarthritis, or strain through the surrounding muscles and tendons. Pain on the outer side can occur with iliotibial band irritation, particularly in runners and cyclists, or after a twisting injury.
A meniscus can be irritated or torn during a sudden pivot, deep squat, or awkward landing, though age-related changes can also develop gradually. Symptoms may include joint-line tenderness, swelling, catching, or a feeling that the knee cannot fully bend or straighten. Not every meniscus concern requires surgery, but locking, significant swelling, or ongoing mechanical symptoms deserve timely assessment.
Stiffness, swelling, and age-related joint changes
Osteoarthritis is another common contributor to knee pain, especially when there is stiffness after rest, discomfort with prolonged standing or walking, or swelling after heavier activity. It reflects changes in the joint over time, but an arthritis diagnosis does not mean you need to stop being active.
In fact, well-chosen strengthening and mobility work are among the most helpful ways to improve confidence, function, and pain levels for many people with knee osteoarthritis. The goal is to find an activity level that challenges the joint without repeatedly flaring it up. Walking, cycling, strength training, and pool exercise may all have a place depending on your symptoms.
A recent twist, impact, or sudden pop
A direct fall, collision, twist, or awkward landing can injure ligaments, cartilage, tendons, or bone. An anterior cruciate ligament injury may involve a pop, immediate swelling, and a sense that the knee gives way. Other injuries are less dramatic but still require attention, particularly if you cannot bear weight normally or the knee feels unstable.
For work injuries, sports injuries, and motor vehicle accidents, early rehabilitation can help restore range of motion, reduce protective stiffness, and guide a safe return to regular responsibilities. The right plan depends on the nature of the injury, your job or sport demands, and your goals.
Everyday Habits That Can Keep Knee Pain Going
Sometimes there is no single injury to blame. Knee pain can build gradually when your body is asked to do more than it has been prepared for. A jump from occasional walks to daily hill running, a new physically demanding job, a long period of reduced activity, or returning to sport after time away can all be enough to trigger symptoms.
Footwear can contribute, particularly if shoes are worn out or poorly matched to the activity, but it is rarely the sole answer. The same is true of posture. A brace, supportive shoe, or tape may provide short-term comfort for some people, yet lasting improvement usually comes from understanding the load problem and improving strength, mobility, and movement tolerance.
Sleep, stress, and recovery also matter. Pain sensitivity can rise when you are fatigued, under pressure, or not recovering well between demanding days. This does not make the pain “all in your head.” It recognizes that pain is influenced by the body’s tissues, nervous system, and overall recovery capacity.
What You Can Do Before Your Assessment
If your knee pain is mild and there has been no major trauma, avoid the all-or-nothing approach. Reduce the activities that clearly spike pain for a few days, but keep moving within a comfortable range. Shorter walks, flatter routes, cycling with low resistance, or modified strength work may be more tolerable than stopping everything.
Pay attention to the 24-hour response. Some discomfort during rehabilitation can be acceptable, especially with tendon or arthritis-related pain, but symptoms should not steadily escalate or leave you substantially worse the next day. Ice or heat may offer short-term relief based on personal preference, although neither replaces a plan to restore capacity.
It also helps to note when the pain occurs, where you feel it, whether it swells, and what movements are difficult. Those details make a physiotherapy assessment more precise.
When Knee Pain Needs Urgent Attention
Seek urgent medical care if your knee looks deformed, you cannot bear weight after an injury, or you have rapidly increasing swelling and severe pain. A hot, red, swollen knee with fever or feeling unwell requires prompt assessment, as does calf swelling, warmth, or unexplained shortness of breath.
Book an assessment soon if the knee repeatedly gives way, locks in one position, cannot fully straighten, or remains swollen after an injury. Persistent pain that limits work, sleep, exercise, or daily mobility is also worth addressing rather than waiting for it to resolve on its own.
How Physiotherapy Helps You Return to Comfortable Movement
A personalized physiotherapy assessment considers your symptoms, injury history, joint movement, strength, balance, walking or running mechanics, and the demands of your daily life. A recreational runner and a Calgary tradesperson may both have knee pain, but their recovery plans should not look identical.
At Sterling Physiotherapy and Wellness, treatment is built around the reason your knee is irritated and the function you want to regain. Hands-on treatment, education, targeted exercise, taping, dry needling, shockwave therapy, or massage therapy may be considered when appropriate. These tools can support pain relief and movement, but progressive rehabilitation remains central to building a knee that is better prepared for work, sport, stairs, and everyday life.
You do not need to wait until the pain becomes severe to seek help. A knee that hurts is often asking for a more specific approach to movement and loading. With the right guidance, gradual progress can replace the cycle of resting, flaring up, and starting over.