Why Does My Knee Hurt Going Up or Down Stairs?

Jennifer Wood, MD, FAAOS is a board-certified orthopedic surgeon specializing in hip and knee care in Danbury and Southbury, Connecticut. She treats knee pain and arthritis with a full range of non-surgical and surgical options, including robotic-assisted and muscle-sparing knee replacement when appropriate.

If your knee hurts going up or down stairs but feels relatively comfortable when you're walking on level ground, there is usually a reason.

Stairs place substantially greater demands on the knee than ordinary walking. Your knee bends farther, your quadriceps work harder, and pressure increases between the kneecap and the thigh bone. That can make conditions such as patellofemoral arthritis, knee osteoarthritis, kneecap tracking problems, muscle weakness, and some meniscus or tendon problems much more noticeable.

One of the first questions I ask is: Where exactly does your knee hurt?

Pain behind the kneecap tells me something very different than pain along the inside of the knee. Whether it hurts going up, going down, or both can provide additional clues.

And importantly, knee pain on stairs does not automatically mean you have severe arthritis—or that you need knee replacement.

Why Does My Knee Hurt Going Down Stairs?

Going downstairs is particularly demanding on the knee.

Each time you lower yourself onto the next step, your quadriceps have to control your body weight while your knee is bent. At the same time, pressure increases between your kneecap and the groove at the end of your thigh bone.

This is why pain going downstairs is especially common when the patellofemoral joint—the joint between the kneecap and the femur—is irritated or arthritic.

You may notice pain:

• Behind or around the kneecap

• When going downstairs

• When squatting

• When getting up from a low chair

• After sitting for a long time with your knee bent

Some people develop these symptoms well before they experience significant pain walking on level ground.

Why Does My Knee Hurt Going Up Stairs?

Going upstairs stresses the knee differently.

Your quadriceps, hip, and gluteal muscles have to generate enough force to lift your body onto the next step. Arthritis, patellofemoral problems, muscle weakness, and certain tendon conditions can all become more noticeable under that additional load.

Again, where you feel the pain matters.

Pain directly behind the kneecap may point toward the patellofemoral joint, while pain concentrated along the inner part of the knee may be more consistent with medial compartment arthritis or a meniscus problem.

Why Does My Knee Hurt on Stairs but Not When I Walk?

This is an extremely common question.

Walking on level ground requires less knee flexion and generally places lower demands on the knee than climbing or descending stairs.

You can therefore have an irritated or arthritic portion of the knee that tolerates ordinary walking reasonably well but becomes painful when the knee bends farther and has to manage greater forces.

Stair pain can sometimes be one of the earlier signs of a knee problem, particularly patellofemoral arthritis or irritation.

It doesn't necessarily mean the problem is severe. It simply gives us another clue about what may be causing your symptoms.

Where Does Your Knee Hurt?

When evaluating knee pain, location matters.

Front of the Knee or Behind the Kneecap

Pain here commonly comes from the patellofemoral joint.

Possible causes include:

• Patellofemoral arthritis

• Irritation of the cartilage behind the kneecap

• Patellar maltracking

• Quadriceps weakness

• Patellar or quadriceps tendon irritation

These conditions may also cause pain with squatting, kneeling, getting out of a chair, or prolonged sitting.

Inside of the Knee

Pain along the inner portion of the knee may be associated with:

• Medial compartment osteoarthritis

• Degenerative or torn meniscus

• Tendon or soft-tissue irritation

As medial compartment arthritis progresses, patients may begin noticing pain not only on stairs but also during prolonged walking or standing.

Outside of the Knee

Pain along the outside of the knee may originate from the lateral compartment of the joint or from surrounding tendons and soft tissues.

A physical examination can often help determine whether the pain is coming from inside the knee joint or from the tissues surrounding it.

Back of the Knee

Pain behind the knee may be related to:

• Arthritis

• Swelling within the knee

• A Baker's cyst

• Hamstring or other soft-tissue problems

Because several different conditions can produce similar symptoms, the location of the pain is helpful—but it doesn't establish the diagnosis by itself.

What Are the Most Common Causes of Knee Pain on Stairs?

Patellofemoral Arthritis

The patellofemoral joint is where the kneecap meets the thigh bone.

Normally, smooth cartilage allows the kneecap to glide through its groove as the knee bends and straightens. When that cartilage becomes worn or irritated, activities that increase pressure across the joint—especially stairs and squatting—can become painful.

Patients commonly describe pain behind or around the kneecap rather than on one specific side of the knee.

Knee Osteoarthritis

Osteoarthritis develops as the cartilage cushioning the knee gradually wears down.

It can affect one part of the knee or several compartments at the same time.

Early arthritis may cause symptoms only during more demanding activities. More advanced arthritis may eventually cause pain with walking, standing, stiffness after sitting, swelling, loss of motion, or pain at rest.

One important point: the severity of arthritis on an X-ray doesn't always match the severity of someone's symptoms.

The severity of arthritis on an X-ray doesn't always reflect how much it affects a person's life. That's why I consider the whole picture—your symptoms, physical examination, activity level, and goals—when recommending treatment, rather than relying on imaging alone.

Patellar Maltracking

Your kneecap is designed to move within a groove at the end of your femur as the knee bends and straightens.

If it does not track optimally, pressure may become concentrated on certain areas of the patellofemoral joint.

This can contribute to pain with stairs, squatting, exercise, or prolonged sitting.

Meniscus Problems

The menisci are cartilage structures inside the knee that help distribute forces across the joint.

A meniscus problem may cause joint-line pain, swelling, catching, or clicking, particularly with twisting or deep knee bending.

However, meniscus tears become increasingly common with age and arthritis. Seeing a meniscus tear on an MRI does not automatically mean that the tear is causing your pain or that it needs surgery.

The imaging finding has to make sense in the context of your symptoms and examination.

Muscle Weakness

Not every painful knee has a structural problem that needs a procedure.

Your quadriceps, hip, and gluteal muscles help control the position of your leg and absorb forces as you use stairs.

When those muscles are weak, stairs may become considerably more difficult.

For the right patient, targeted strengthening can make a meaningful difference.

What Can I Do for Knee Pain on Stairs?

Treatment should address the cause of the pain rather than simply the symptom.

Depending on your diagnosis, options may include:

• Activity modification

• Physical therapy

• Quadriceps and hip strengthening

• Weight management when appropriate

• Topical or oral anti-inflammatory medication when medically appropriate

• Bracing in selected patients

• Corticosteroid injections

• Hyaluronic acid (gel) injections

Not every patient needs every treatment.

Someone with mild patellofemoral irritation and muscle weakness needs a very different plan than someone with advanced bone-on-bone arthritis.

That's why getting the diagnosis right matters.

Should I Avoid Stairs If My Knee Hurts?

Not necessarily.

Pain doesn't automatically mean that using stairs is damaging your knee.

If stairs cause mild discomfort but you can navigate them safely, you may not need to eliminate them completely. Temporarily reducing repetitive stair climbing while addressing inflammation, strength, or mechanics can sometimes help.

However, if the knee feels unstable, gives way, becomes significantly swollen, or the pain is severe enough that you cannot safely use the stairs, you should have it evaluated.

Do I Need an X-Ray or MRI?

For many patients, weight-bearing knee X-rays are the best place to start.

Weight-bearing images allow us to evaluate the knee while the joint is actually under load. They can show where cartilage has been lost, whether arthritis affects one or multiple compartments, and whether there are changes in the alignment of the knee.

An MRI answers different questions.

It can be useful when symptoms suggest a meniscus, ligament, tendon, cartilage, or other soft-tissue problem that isn't adequately explained by the examination and X-rays.

But not everyone with knee pain needs an MRI.

If weight-bearing X-rays already demonstrate advanced arthritis and the symptoms and examination are consistent with that diagnosis, an MRI often doesn't change the treatment plan.

Does Pain on Stairs Mean I Need Knee Replacement?

Not necessarily. Difficulty with stairs can be an important sign of a knee problem, but it does not by itself mean that knee replacement is necessary.

Difficulty with stairs is one symptom we consider, but stair pain alone is not an indication for knee replacement.

Even patients with arthritis on their X-rays may be able to manage their symptoms successfully with non-surgical treatment for years.

Knee replacement becomes more appropriate when arthritis is advanced, symptoms substantially interfere with everyday life, and appropriate conservative treatments no longer provide enough relief.

The question isn't simply:

"How bad does my X-ray look?"

A much more useful question is:

"How much is my knee preventing me from living the life I want?"

When Should I See a Knee Specialist?

You don't need to wait until you can barely walk before having knee pain evaluated.

Consider seeing a knee specialist when pain:

• Persists or progressively worsens

• Regularly makes stairs difficult

• Causes recurrent swelling or stiffness

• Limits walking or exercise

• Causes catching, locking, or giving way

• Interferes with work, travel, sleep, or everyday activities

• Prevents you from participating in activities that matter to you

An orthopedic evaluation doesn't mean you're committing to surgery.

For many patients, the most valuable part of the visit is simply understanding what is causing the pain and what can be done about it.

What I Tell My Patients

Knee pain on stairs is a symptom—not a diagnosis.

When someone tells me their knee hurts on stairs, I don't immediately assume they have arthritis, and I certainly don't assume they need surgery.

I want to know where it hurts. Does it hurt going up, going down, or both? Does the knee swell? Does it catch or give way? Can you walk comfortably on level ground? What activities have you stopped doing because of it?

I combine those answers with the physical examination and appropriate imaging to determine what is most likely causing the problem.

Some patients need strengthening and physical therapy. Some benefit from medications or injections. Some have arthritis that can be successfully managed without surgery for many years. And some eventually reach a point where knee replacement offers the best opportunity to reduce pain and restore mobility.

My job isn't to convince you to have surgery. It's to figure out why your knee hurts, explain your options clearly, and help you choose the treatment that makes the most sense for your life.

The Bottom Line

If your knee hurts going up or down stairs, don't assume the worst.

Stair pain does not automatically mean severe arthritis, and it does not automatically mean you need knee replacement.

Stairs simply ask more of your knee than ordinary walking, which can make an underlying problem noticeable sooner.

Where the pain occurs, what activities reproduce it, your examination, and appropriate imaging can usually provide important clues about the cause.

The goal isn't simply to make stairs easier. It's to understand what's causing your pain and help you stay active doing the things that matter to you.

Schedule an Appointment

If knee pain is making stairs, walking, exercise, or everyday activities more difficult, schedule an appointment in Danbury or Southbury, Connecticut, by calling 833-678-4628.

At your appointment, I'll listen to what's been bothering you, examine your knee, review the appropriate imaging, and explain what I think is causing your symptoms. From there, we'll discuss your options and develop a treatment plan based on your individual needs, activity level, and goals—whether that means conservative treatment or, when appropriate, knee replacement.