Written by the Nuvirox Research Team
Key Points
- Most joint cracking and popping is gas bubbles releasing inside the joint fluid — not bone grinding on bone.
- A 2025 systematic review found joint crepitus doesn't reliably predict osteoarthritis on its own; plenty of pain-free joints crack constantly.
- The sounds worth paying attention to are the ones that come with pain, swelling, or a joint that catches or gives way.
Short answer: your joints are almost certainly fine, and the sound is mostly a plumbing phenomenon, not a wear-and-tear one. Cracking, popping, and grinding noises (the medical umbrella term is crepitus) tend to show up more in your 40s and beyond, and it is genuinely unsettling to suddenly hear your knees announce every squat. But the honest reading of the research is that noise and joint damage are only loosely related — some of the loudest, crackliest joints in any study population are completely healthy, and some genuinely damaged joints are silent.
What's Actually Making That Sound?
There are really three different sound-makers hiding under the single word "crepitus," and they mean different things.
Real-time MRI work confirms the gas-cavitation story directly: researchers pulled on finger joints inside an MRI scanner and watched a cavity form in the joint fluid at the exact moment of the pop — not a bubble collapsing, as was long assumed, but a cavity forming under sudden negative pressure. That single mechanical event explains why a joint that just cracked usually can't crack again right away — it takes time for the gases to redissolve.
Does Cracking Your Knuckles Cause Arthritis?
No — and this is one of the better-settled questions in the crepitus literature. Habitual knuckle-cracking has been compared against non-cracking hands and shown no meaningful difference in arthritis rates. The sound is the gas-cavitation mechanism above, repeated deliberately, and it does not accelerate cartilage wear. What can loosen over years of forceful cracking is grip strength or hand swelling in heavy, repeated crackers — but that's a separate and much smaller effect, not arthritis.
What Human Research Actually Shows
A 2025 systematic review focused specifically on knee crepitus pooled the available prevalence and association data and concluded that while crepitus becomes more common with age and is associated with osteoarthritis at a population level, it is a poor individual predictor — many people with frequent, loud crepitus have no structural knee disease on imaging, and some with confirmed osteoarthritis report little to no noise. That's the honest counterweight: crepitus correlates with OA in aggregate, but it doesn't diagnose it in any one person.
A 2024 study relating crepitus intensity to muscle mass found that louder, more intense knee crepitus was associated with thinner quadriceps muscle, not necessarily worse cartilage — suggesting that at least part of what people hear may reflect how well the joint is mechanically supported, not just how worn it is. That opens a genuinely actionable angle: the muscle around a joint is something you can train, even if you can't change the cartilage.
The MRI cavitation study described above remains the clearest mechanistic evidence for what's happening in a healthy, cracking joint, and it's been replicated enough that "gas bubbles" is now the accepted explanation for the classic knuckle-crack sound, displacing older theories about bubble collapse.
What Crepitus Won't Tell You
Noise alone is not a diagnostic tool, and treating it as one cuts both ways: a quiet joint isn't automatically a healthy one, and a loud joint isn't automatically a damaged one. What actually distinguishes ordinary crepitus from something worth investigating is the company it keeps. See a doctor or physical therapist if the noise is joined by pain, visible swelling, warmth, a joint that catches or locks mid-motion, or a sense that the joint is giving way — those are signs pointing toward osteoarthritis, meniscus involvement, or ligament laxity, and crepitus by itself isn't enough information to sort out which.
What Can Actually Help
If your joints are noisy but not painful, there isn't a supplement or ritual proven to silence a joint that's doing gas cavitation, and you generally don't need one. What the research does support is strengthening the muscles crossing the joint — quadriceps for the knee, rotator cuff for the shoulder — since that 2024 finding on crepitus intensity and muscle thickness lines up with decades of broader evidence that stronger supporting muscle reduces joint loading and, in many people, joint pain. Regular movement through full range of motion also keeps synovial fluid circulating, which is the fluid doing the cavitating in the first place. It's also worth noting that joint stiffness and joint noise are related but separate complaints; if what you're actually describing is more of a tightness that eases as you move rather than a distinct pop, that pattern is covered in more depth in our piece on morning joint stiffness and the 30-minute rule.
Frequently Asked Questions
Is it bad to crack my own joints on purpose?
Not based on the available evidence — habitual knuckle-cracking hasn't been linked to higher arthritis rates in comparative studies. It's more a matter of personal (or a coworker's) preference than injury risk.
Why does the same joint sometimes crack every time I move it, and other times not at all?
It depends on how much gas has redissolved into the synovial fluid since the last pop. Right after a crack, there typically isn't enough dissolved gas to form a new cavity, which is why you usually can't crack the same knuckle twice in a row.
My knees crack loudly but don't hurt at all — should I be worried?
Painless crepitus, even loud crepitus, is common and usually not a sign of joint damage on its own. The 2025 systematic review found it's a weak individual predictor of osteoarthritis. Pain, swelling, or a joint giving way are the signals worth acting on.
Does joint cracking get louder with age even if nothing is wrong?
Yes — reduced elasticity in tendons and ligaments, along with changes in how the joint capsule moves, can make the same underlying gas-cavitation mechanism produce a more noticeable sound over the decades, independent of any disease process.
From Nuvirox
Why we formulated NAD+ Restore
Joints that click and pop rely on the same cellular machinery — mitochondria, energy metabolism, and repair processes — that changes as you get older. NAD+ Restore is built around ingredients studied for their role in supporting cellular energy pathways — we keep the formulation philosophy-first here because our formulation is currently being refined, and we would rather describe what we are trying to accomplish than list specifics that may change.
It comes with a 60-day money-back guarantee — long enough to actually evaluate it the way the research says you should.
Learn more about NAD+ Restore →The Bottom Line
The pop, crack, or grind coming from your joints is, in the great majority of cases, gas leaving solution or soft tissue sliding over bone — a mechanical event, not evidence of cartilage breakdown. The research is honest that crepitus correlates loosely with osteoarthritis at a population level without predicting it reliably in any individual. Track the company the noise keeps — pain, swelling, instability — rather than the noise itself, and put your effort into the muscle around the joint, which is the one variable in this picture you can actually change. If grip and hand strength are part of what feels different lately, that overlaps with a separate but related pattern we cover in why grip strength weakens with age, and jaw joints follow a surprisingly similar mechanical story — see why your jaw pops when you chew.
References
- Teichtahl AJ, Wluka AE, Wang Y, et al. Knee crepitus: A systematic review of prevalence, incidence, and associations with knee osteoarthritis. Osteoarthritis Cartilage Open. 2025;7(1):100471.
- Kawchuk GN, Fryer J, Jaremko JL, Zeng H, Rowe L, Thompson R. Real-time visualization of joint cavitation. PLoS ONE. 2015. PMCID: PMC4398549.
- Jakovacz N, Mészáros Z, Farkas J. Relationship between knee crepitus intensity and quadriceps muscle thickness. Man Ther. 2024;66:107102.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.