If your knee clicks, pops or cracks but doesn’t hurt, it’s often nothing to worry about. Painless knee clicking is common, particularly during movements such as squatting, climbing stairs or standing up.

The sound itself doesn’t necessarily mean something is damaged. However, clicking that develops alongside pain, swelling, locking, giving way or a recent injury deserves more attention.

Below, we look at why a knee can click without pain, when it may be normal and when it’s worth getting checked.

Why Is My Knee Clicking but Not Painful?

People describe it in a few different ways:

• A clicking or popping sound when bending or straightening the knee
• A crack or snap when standing up, squatting, or walking upstairs
• A feeling of something moving or shifting slightly inside the joint
• Occasional grinding or crunching (without pain)

It might happen:

• Every time you move your knee
• Only during certain movements (like squats or lunges)
• Randomly, without any clear pattern

Here’s the key point:
👉 If there’s no pain, swelling, or instability, it’s usually not a big deal.

Common Causes of Knee Clicking Without Pain

There’s no single cause. In fact, most clicking comes down to normal joint mechanics.

1. Gas Bubbles (Joint Cavitation)

This is the same idea as cracking your knuckles.

Inside your joints is fluid. Changes in pressure inside a joint can sometimes create popping or cracking sounds during movement.

2. Ligaments and Tendons Moving Over Bone

As your knee bends and straightens, ligaments and tendons shift slightly.

Sometimes they:

• Slide over a bony surface
• Snap back into place

That movement can create a quick clicking or snapping sensation.

3. Movement Around the Kneecap

The kneecap moves along the front of the knee as you bend and straighten your leg. Movement between the kneecap, surrounding soft tissues and the joint can sometimes produce clicking or grinding sensations.

If there is no pain, swelling or loss of function, the noise alone does not necessarily indicate a problem.

4. Previous Injury (Even Minor)

If you’ve ever had:

• A small twist
• A sports injury
• A knock to the knee

Some people notice clicking after a previous knee injury, even after the original symptoms have settled.

If the clicking began after an injury and is accompanied by pain, swelling, locking or giving way, it’s worth having the knee assessed.

When Knee Clicking Is Normal (and When It’s Not)

Knee clicking without pain is often harmless, especially when the knee otherwise feels and functions normally.

Likely Normal

• No pain at all
• No swelling
• Full range of movement
• No feeling of the knee giving way
• Clicking has been there for ages without getting worse

If this sounds like you, you can relax. Your knee is just being… noisy.

Might Need Attention

Clicking starts to matter when it comes with other symptoms:

• Pain (even mild, especially if it’s increasing)
• Swelling
• Stiffness
• Locking (knee gets stuck)
• Instability (feels like it might give way)
• Reduced movement

If you notice any of these, it’s worth paying attention.

How to Tell If It Needs Attention

You don’t need to panic—but you do need to observe.

Ask yourself:

1. Has Anything Changed Recently?

• New workout routine?
• More walking, running, or stairs?
• Sitting more than usual?

2. Is It Getting Worse?

• More frequent?
• Louder?
• Starting to feel uncomfortable?

Progression matters more than the clicking itself.

3. Does It Affect Movement?

If your knee:

• Feels stiff
• Doesn’t move smoothly
• Makes you hesitate during movement

That’s a sign to take it more seriously.

4. Is There Any Pain (Even Slight)?

This is the big one.

If your knee clicking is accompanied by discomfort, you might also notice issues like knee pain when straightening your leg…

👉 Knee pain when straightening leg – causes, what it means, and what to do

Pain changes the whole picture. Clicking accompanied by pain deserves more attention, particularly if the pain persists or worsens.

5. Does It Happen in Specific Movements?

For example:

• Squatting
• Climbing stairs
• Getting up from sitting

Some people also notice sensations when bending the knee, such as pain below the kneecap when bending…

👉 Pain below kneecap when bending, causes, what it means, and what to do

This can help narrow down what’s actually causing it.

What Should You Do About a Clicking Knee?

If it doesn’t hurt:
You generally don’t need to stop normal exercise or everyday activity just because your knee makes noise.

Keep an eye on changes:
Pay attention if clicking becomes painful or is accompanied by swelling, locking, giving way or reduced movement.

Don’t try to eliminate every click:
A completely silent knee isn’t the goal. Comfortable movement and normal function matter more.

When Should I Worry About Knee Clicking?

Most people with clicking knees never need medical treatment.

But you should get it checked if you have:

• Persistent pain
• Swelling that doesn’t go away
• Locking or catching
• Instability
• A recent injury followed by clicking
• Clicking that’s getting worse over time
• Redness or heat around the knee
• Feeling unwell or feverish along with knee symptoms

A GP or physiotherapist is usually a sensible first point of contact.

FAQ: Knee Clicking Without Pain

Is knee clicking without pain normal?

Yes. In most cases, it’s completely normal and nothing to worry about.

Why does my knee click when I squat but not hurt?

Clicking during squats can come from normal movement of the kneecap, tendons and other tissues around the knee, as well as changes in pressure within the joint.

If the clicking isn’t accompanied by pain, swelling, locking or giving way, the sound alone usually isn’t a cause for concern.

Why does my knee click when I walk?

Knee clicking while walking can happen because of normal movement of the kneecap, tendons and other soft tissues around the joint.

If there’s no pain, swelling, locking or instability, the clicking alone is usually not a cause for concern.

Should I stop exercising if my knee clicks?

Not necessarily. If the clicking is painless and your knee otherwise feels and functions normally, you generally don’t need to stop your usual activity just because of the noise.

If exercise causes pain, swelling, locking or instability, reduce the aggravating activity and consider having the knee assessed.

Does clicking mean I have arthritis?

No. Knee clicking by itself does not mean you have arthritis.

Crepitus is common in people both with and without osteoarthritis. Research has found an association between frequent knee crepitus and osteoarthritis, but a clicking sound alone cannot diagnose it.

If clicking is accompanied by persistent pain, stiffness, swelling or reduced function, it is worth discussing with a health professional.

When should I worry about a clicking knee?

A clicking knee is more concerning if it comes with persistent or worsening pain, swelling, locking, giving way, reduced movement or follows a recent injury.

Redness, heat around the knee or feeling unwell should also be assessed promptly.

The Bottom Line

Knee clicking without pain is common and, by itself, usually isn’t a sign that something is wrong.

Joint sounds can come from normal movement of the kneecap, tendons and other tissues, as well as changes in pressure inside the joint.

If your knee moves normally and there’s no pain, swelling, locking or instability, the clicking alone usually isn’t something you need to treat.

If new symptoms develop — particularly persistent pain, swelling, locking or giving way — it’s worth getting the knee assessed.

Sources

• NHS. Knee pain — symptoms and when to seek medical advice.
• National Library of Medicine / PubMed. Research on knee crepitus and osteoarthritis.
• Cochrane. Exercise therapy for patellofemoral pain.