Cracking your back or neck causes arthritis
She had cracked her back every morning for twenty years and felt tremendous relief each time. Then she read something online that convinced her she was developing arthritis. She'd stopped, and her back felt awful. She wanted to know — was she right to stop?
What Patients SayI crack my back and neck constantly — it feels so good. But my mother keeps telling me I'll get arthritis. Am I doing damage every time I do this?
Where Did This Come From?
This one has been passed down from generation to generation as a cautionary tale. It's probably one of the most widespread health myths around joints. The sound of cracking is vivid and seems like something breaking or grinding. It's natural for parents and grandparents to assume it's damaging.
There's also a bit of cultural disapproval bundled in — cracking your knuckles at a dinner table is considered rude in many cultures, and the "you'll get arthritis" warning may have been partly a social deterrent that got medicalised over time.
What the Science Actually Says
The classic study on this is genuinely delightful. Dr. Donald Unger cracked the knuckles of one hand every day for 60 years while never cracking the other hand — and found no difference in arthritis between the two hands. He published a letter in Arthritis & Rheumatism and won an Ig Nobel Prize for the effort. Commitment to science.
More rigorous studies have confirmed the finding. The sound produced by joint cracking is called cavitation — it's the rapid formation and collapse of gas bubbles in the synovial fluid within the joint, triggered by the sudden pressure change. It's harmless. No structural damage occurs. There's no evidence it causes arthritis.
There are some caveats. Forceful, repetitive self-manipulation of specific joints could theoretically cause local soft tissue issues over very long timeframes, though evidence for this is weak. And there's a difference between spontaneous cracking (joints cracking as you move normally) and forceful forced cracking (manipulating a joint at its limit specifically to produce the crack). The former is essentially always harmless. The latter — particularly in the neck — warrants more care.
The Verdict
Cracking your back or neck does not cause arthritis. The sound is harmless gas cavitation in the joint. Sixty years of knuckle-cracking research confirms this.
What To Do Instead
- Understand that the cracking is harmless — remove the anxiety
- If you crack your neck habitually for relief, consider whether the underlying stiffness warrants assessment
- Be cautious with forceful self-manipulation of the cervical spine — the anatomy there is more complex and contains the vertebral arteries
- If joints crack spontaneously during normal movement, that's normal — it doesn't require treatment
Yellow Flags — Worth Monitoring
- Cracking accompanied by pain — cracking itself is harmless, but pain with movement is different and worth assessing
- A joint that needs to be cracked constantly to feel comfortable — this may indicate hypermobility or instability worth reviewing
Red Flags — Get Checked Immediately
- A crack followed by immediate dizziness, vision changes, or difficulty speaking — possible vertebral artery involvement, this is an emergency
- A crack followed by new persistent neurological symptoms
- Unger DL, "Does knuckle cracking lead to arthritis of the fingers?" Arthritis & Rheumatism, 1998. Boutin RD et al., "In Vivo Imaging of Knuckle Cracking," PLOS ONE, 2015.