Joint Noises: What’s Normal and When to Be Concerned

Cracking your knuckles makes noise, but it isn't harmful.

Cracking, clicking, popping or creaking joints can be unsettling, but a noisy joint doesn't automatically mean disease or injury. In many cases, joints are simply noisy, and that noise is completely normal.

If there's no pain, swelling or loss of function, joint sounds are usually harmless. Joints contain many moving structures, and several natural processes can create audible noise: tendons and ligaments gliding over bone, tissues rubbing against one another, and gas bubbles forming between joint surfaces. None of these are inherently harmful.

Why joints make noise

Snapping and clicking

Snapping or clicking often happens when tendons or ligaments move over bony prominences, especially within small joint spaces. It can be more noticeable when tissues are tight or stiff. In these cases, consistent stretching and mobility work may help reduce tension, letting tissues glide more smoothly and potentially reducing how often or how strongly they snap.

Creaking and stiffness

If your joints feel creaky or stiff, especially after sitting for a long time or first thing in the morning, the solution is often simple: move more. "Motion is lotion" holds true. Movement circulates synovial fluid, which lubricates joint surfaces and reduces friction. When we stay still, synovial fluid has limited contact with the joint cartilage, so joints can feel stiff or noisy when movement resumes.

Is cracking your joints bad for you?

This is one of the most common questions we hear. When you crack a joint, the popping sound is called a cavitation. It happens through a process known as tribonucleation, in which joint surfaces are rapidly separated, creating a small space where gas bubbles form. The formation of those bubbles produces the audible "pop."

The important takeaway: joint cracking isn't harmful. Physical therapists and other manual therapy practitioners often use joint mobilizations or manipulations, high-velocity, low-amplitude techniques that may or may not produce a cavitation. These techniques can provide temporary relief, but they aren't a standalone or long-term solution.

When joint noise might matter: crepitus

Not all joint sounds are the same. Crepitus is a grinding or grating sensation that may be felt or heard during joint movement. It can come from cartilage, bone or soft tissue and may occur with or without pain.

Crepitus is sometimes associated with conditions such as osteoarthritis or tissue changes. However, research has shown that knee crepitus doesn't necessarily correlate with reduced strength or objectively measured function, even in people with osteoarthritis. Interestingly, studies have found that people with crepitus often report lower perceived function, reduced quality of life, increased emotional distress and avoidance of movement.

That suggests the way we interpret the noise, rather than the noise itself, may have a bigger impact on function. Even when crepitus has a pathological origin, it doesn't mean inevitable joint deterioration. The fear associated with joint noise often becomes a larger barrier than the physical issue.

Listen to your body

Joint noises are common and, in most cases, completely normal. Understanding why they happen can help reduce unnecessary worry. If joint noise occurs without pain, swelling or functional limitations, it's usually nothing to worry about. If joint sounds follow a traumatic event or come with pain or loss of function, it's wise to consult a medical professional. Noisy joints are a normal part of being human.

Joint noise that comes with pain, swelling or trouble moving? Our physical therapists can assess what's going on and help you move with confidence.

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the takeaway

Cracking, clicking and creaking joints are usually harmless when there's no pain, swelling or loss of function. Cracking your knuckles isn't bad for you, and even crepitus doesn't necessarily mean weaker or worse-functioning joints. See a professional if noise follows an injury or comes with pain.

Frequently asked questions

Why do my joints crack and pop?

Common causes include tendons and ligaments gliding over bone, tissues rubbing against each other, and gas bubbles forming when joint surfaces separate, a process called cavitation. None of these are inherently harmful.

Is cracking your knuckles bad for you?

No. The pop comes from gas bubbles forming as the joint surfaces rapidly separate, and joint cracking isn't harmful.

What is crepitus?

A grinding or grating sensation felt or heard during joint movement. It can come from cartilage, bone or soft tissue and may occur with or without pain.

When should I worry about joint noise?

If the noise follows a traumatic event or comes with pain, swelling or loss of function, it's wise to consult a medical professional.