Why Does My Knee Hurt Going Down Stairs (But Not Up)?

If your knee complains on the way down the stairs but behaves itself on the way up, you're not imagining it — and you're definitely not alone. It's one of the most common things we hear in clinic at TAP, usually said with a slightly baffled expression: "Surely going up should be harder?"

Here's the short answer: going downstairs loads your kneecap far more than going up. When you lower yourself down a step, your quads have to work like a brake, controlling your whole bodyweight as your knee bends. That braking action squeezes the kneecap against the thigh bone with a force several times your bodyweight. Going up is hard work for your muscles — going down is hard work for your knee.

So downstairs pain isn't random. It's a clue. And it usually points to one of a handful of very fixable problems.

The usual suspects

Runner's knee (patellofemoral pain). The most common cause we see, and not just in runners. Pain around or behind the kneecap that flares with stairs, hills, squatting and long sits (the classic "cinema seat" ache). It's usually a load and control problem — the knee is taking more than its share because of what's happening at the hip or foot — not damage.

Patellar tendon pain. A more pinpoint pain just below the kneecap. It hates stairs, jumping and lunges, and it tends to "warm up" during activity then bite the next morning. Tendons don't want rest — they want the right amount of load, built up progressively.

Knee osteoarthritis. In knees that are stiff first thing and grumble on stairs, some age-related change is common — and far less scary than it sounds. What a scan shows and what you feel are surprisingly loosely connected, and the strongest evidence for arthritic knees is progressive strength work.

Meniscus irritation. If there's catching, clicking or a feeling the knee might lock, the shock-absorbing cartilage may be irritated — from a twist, or wear that's crept in gradually. Most do very well without surgery when rehab is done properly.

The mistake almost everyone makes

Rest. Total, well-intentioned rest.

Rest calms a cranky knee down — but it doesn't change why the knee got cranky. So three weeks later, you jog to catch the bus or carry the washing downstairs, and it's back. Sound familiar?

The knee is usually the bit in the middle paying the price for something above or below it: a hip that isn't controlling the leg, a foot that isn't absorbing load, or training (or a life) that jumped ahead of what the tissue could handle. Until that's found and fixed, the pain keeps making comebacks.

Three things to try this week

1. Keep moving, change the dose. Swap the aggravating stuff (deep squats, downhill running) for what your knee tolerates — cycling, flat walking, upper body work. Movement is medicine here; the skill is in the dose.

2. Go down stairs like a skier. Slightly soft knees, lead with the stronger leg, use the rail without shame. It's temporary, not forever.

3. Start gentle quad and hip work. Sit-to-stands from a chair and step-ups onto a low step, kept to a comfortable level, are a decent starting point for most knees.

When to get it looked at

Book an assessment if the pain has hung around more than a couple of weeks, wakes you at night, comes with swelling or giving way, or it's started changing how you move. A knee that locks solid, swells rapidly after an injury, or follows a proper twisting incident should be assessed promptly.

At TAP, a knee assessment isn't a quick glance at the sore bit. We look at the whole chain — knee, hip, ankle, strength, gait, training history — find the actual cause, treat it hands-on from the first session, and rebuild the knee so it's stronger than before the pain started. It's why our results tend to last when quick fixes don't.

Quick answers

Should I get a scan first? Usually no. A thorough physical assessment diagnoses most knee problems accurately, and scans often show "findings" in completely pain-free knees. If imaging would genuinely change your treatment, we'll say so.

Is it bone on bone? Almost certainly not. Even in arthritic knees this phrase is more drama than anatomy — and pain levels don't match scan results anyway.

Can I still run? Often yes, with the load adjusted. Complete stopping is rarely necessary and rarely helpful.

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Knee pain interrupting your stairs, your runs or your sleep? We can usually see you the same week at our Warwick or Stratford-upon-Avon clinics — no GP referral needed. Book your physiotherapy assessment or learn more about physiotherapy in Warwick and physiotherapy in Stratford-upon-Avon.