Knee pain when climbing stairs: common causes and when to see a specialist

Stairs load the knee far more than walking on level ground. With every step up, the thigh muscle pulls the kneecap firmly against the thigh bone, so any irritation in that joint, or in the cartilage of the knee itself, tends to show up on stairs first.

The most common causes

• Pain behind the kneecap (patellofemoral pain). An ache at the front of the knee, worse on stairs, squatting, or after sitting for a long time. Common in active younger adults.
• Knee osteoarthritis. Gradual wear of the joint surface. Typically stiffness in the morning, pain that builds with activity, and sometimes swelling. More common after 50.
• Tendon irritation. Pain just below the kneecap, often in people who run, jump or have recently increased activity.
• Meniscus problems. Pain along the inside or outside of the knee, sometimes with catching or locking.

What you can do now

• Keep moving, but reduce the activities that clearly flare the pain for a week or two.
• Use the handrail and lead with the stronger leg going up, the sore leg going down.
• Gentle strengthening of the thigh and hip muscles is the single most effective long-term treatment for most knee pain.
• If you are overweight, even modest weight loss reduces the load through the knee on every step.

When to see a specialist

Book an assessment if the pain has lasted more than three or four weeks, keeps returning, or is affecting your work, sleep or walking. A specialist examination, and sometimes an X-ray, tells you which structure is causing the pain so treatment can be targeted rather than guessed.

Most people with knee pain do not need surgery. A clear diagnosis followed by a structured physiotherapy programme resolves or controls the majority of cases. Surgery is considered when the joint is badly damaged or a mechanical problem has not settled with good rehabilitation.