Are Deadlifts Bad for Your Lower Back? What Spinal Loading Research Shows

Are deadlifts bad for lower back health? Not on their own. The deadlift loads your spine heavily, but the research does not show that it injures healthy lifters when load is built up sensibly, and trials in people with back pain have used loaded lifting as treatment.

The fear is understandable, because almost everyone has a story about someone who “threw their back out” lifting something. This article is part of our guide to joint-friendly lifting and myth busting, and it goes through what the studies actually say about spinal loading, rounding, disc worries and who should adjust the lift.

What happens to your spine in a deadlift?

Two kinds of force matter. Compression squeezes the vertebrae and discs together. Shear tries to slide one vertebra forward over the next.

A 2022 narrative review of the deadlift literature reports that heavy deadlifts produce spinal compression of roughly 5-18 kN and shear of roughly 1.3-3.2 kN (Ramirez et al., 2022). Earlier work on national-level powerlifters estimated average L4/L5 compression of up to about 17,000 N (Cholewicki et al., 1991).

Those numbers sound scary. They need context.

First, these are modelled estimates, not measurements taken inside a disc. Second, the same review notes that shear loads in heavy deadlifts exceed occupational injury thresholds, and it argues that repetitive heavy deadlifting in physically demanding jobs needs more research. It also says outright that no studies of low back biomechanics during repetitive deadlifts were found (Ramirez et al., 2022). The authors accept that trained people likely have stronger musculoskeletal systems than the general population, but they still describe shear forces 2 to 4 times the injury threshold as a concern, especially with repeated heavy pulls. So the thresholds may not map neatly onto a lifter who builds up over months, but the numbers are not something to wave away either.

So the honest read is this. The deadlift is a high-demand lift. High demand is not the same as harmful, any more than a heavy squat is harmful to a trained knee. Load is a dose.

Is deadlifting dangerous for your spine? What injury data says

Here is the data most worth looking at. A 2011 questionnaire study of 245 competitive and elite powerlifters calculated an injury rate of 0.3 injuries per lifter per year, or about one injury per 1,000 hours of training, and the authors described it as low compared with other sports (Siewe et al., 2011). The lower back was among the most commonly injured regions, along with the shoulder and knee.

Two caveats. These are self-reports from people who stayed in the sport, so anyone who quit after a back injury is missing. And powerlifters squat and bench as well, so the lower-back injuries cannot all be pinned on deadlifts.

The same study found that lifters who used weight belts reported more lumbar injuries. That is an association, not proof that belts cause injury (lifters with sore backs may reach for a belt more often).

Deadlift lumbar flexion and disc herniation: how much rounding is too much?

Gym advice says “never round your back”. The research is more nuanced than that, and also not a free pass.

A 2025 motion-capture study of 13 participants lifting at 60%, 70%, 80% and 90% of their one-rep max found that lower thoracic and upper lumbar flexion increased as the load rose, and the pelvis tilted backwards faster with heavier loads (Shoji et al., 2025). The authors suggest that while lumbar flexion can help complete a heavy lift, it may increase stress on the discs, so keeping lordosis and trunk rigidity matters in high-load lifts.

In plain terms: lumbar movement grows as the load gets heavy, and the authors think staying stable is safer for the discs. That study was small, short and did not follow lifters over time to see who got hurt, so nobody can give you a precise number of degrees that is “safe”.

In the gym, this looks like the bar drifting forward, hips shooting up and the lower back folding as the last rep gets ugly. That rep is the one to skip.

Do deadlifts help or hurt people who already have back pain?

This is where the fear-avoidance story gets tested. If heavy lifting were reliably harmful for sore backs, trials would show it.

In a Swedish randomized trial, 70 adults with recurrent low back pain did either low-load motor control exercises or a high-load lifting exercise, 12 sessions over 8 weeks, plus pain education. Both groups improved significantly in pain, strength and endurance. The motor control group improved more on a patient-rated function scale (4.2 points versus 2.5), but pain intensity and strength did not differ between groups (Aasa et al., 2015). The abstract describes a high-load lifting exercise rather than naming the deadlift, so read it as supportive but not proof about this exact lift.

A wider look backs the same theme. A 2021 meta-analysis of 8 randomized trials (408 participants) found that 12-16 weeks of posterior-chain resistance training reduced pain and disability, and increased strength, more than general exercise, with no difference in adverse events (Tataryn et al., 2021). The pain result sat right on the edge of statistical significance, and the authors noted that future research should compare specific movements such as the deadlift.

Then there is the newer, more sobering check. A 2025 meta-analysis of 13 trials (778 participants) compared externally loaded resistance training with unloaded exercise in chronic non-specific low back pain. At follow-ups beyond seven weeks it found a small pain benefit for loaded training (about 0.5 points on a 0-10 scale), no differences at short follow-up, and inconsistent disability results (Ranzani et al., 2025). The authors concluded that loaded training is safe and feasible, but works about as well as unloaded exercise, with benefits driven more by exposure and adherence than by load.

A review of systematic reviews reached a similar place: small, mostly short-term benefits across several exercise types, with no major differences between them, and very low to moderate certainty (Grooten et al., 2022).

So what is the cautious takeaway? Deadlifts are not something people with chronic non-specific back pain have to avoid. But they are not magic either. If you enjoy them and tolerate them, keep them. If they flare you, a gentler hinge or other exercise will probably serve you about as well.

How to deadlift safely: a simple checklist

None of this is exotic. Most of it is boring, which is why it works.

• Start lighter than your ego wants. Practise the hinge with a Romanian deadlift (see our RDL guide) before you chase heavy conventional pulls.
• Hinge, do not squat it. Push the hips back, keep the bar close and let the knees bend just enough.
• Brace before you pull. Take a breath into your belly, tighten your midsection, then lift.
• Set your back before the bar moves. Take the slack out of the bar so you are not yanking from a rounded start.
• Add load in small steps. Two to five kilos is plenty. Our 1RM calculator helps you pick working weights without testing a true max.
• Keep reps in reserve. Stop sets when you could still do one or two clean reps. The RIR and RPE calculator is built for this.
• Count your weekly volume. Once or twice a week is usually enough.

Different styles load the spine a little differently. In national-level powerlifters, the sumo style showed an estimated 10% lower L4/L5 joint moment and 8% lower shear force than conventional pulling (Cholewicki et al., 1991). That is a modelled difference in elite lifters, so do not switch just for that. Our conventional vs sumo breakdown covers the trade-offs, and the conventional deadlift analysis looks at what the lift does for back muscle growth.

Who should modify deadlifts (and how)?

Some people should change the lift rather than quit it. These groups deserve extra care.

• A current back flare. Reduce load, reduce reps, raise the bar start height (blocks or a trap bar) or switch to RDLs.
• A diagnosed disc problem, spinal condition or recent surgery. Ask your doctor or physio what loading is right for you. The studies above are mostly on non-specific back pain, not on these conditions.
• Beginners and returners. Take a few weeks to groove the hinge before going heavy.
• Long desk days or poor sleep. If your back is stiff and cranky, take an easier session.
• Very tall lifters or long-torso lifters. The range of motion can be harder. Elevating the bar slightly can help.
• Anyone returning after injury. Use a graded plan like our traffic light return-to-gym model.

If the deadlift simply does not feel right for your body, our lower back friendly leg and back workout shows how to keep training hard without it. And if you are wondering whether squats carry the same fear, we cover that in are squats bad for your knees.

What about pain, soreness and fear?

A tight, achy lower back for a day or two after a heavy deadlift day is common, especially in newer lifters. It is not the same as sharp, worsening or shooting pain.

Beliefs matter too. Telling yourself your spine is fragile can make you move stiffly and brace for every rep, which tends to make people avoid lifting more. The trials above included pain education alongside exercise, and the 2025 meta-analysis argues that exposure and adherence seem to matter more than load intensity alone. That does not mean ignore pain. It means treat a sore back as a signal to adjust, not a verdict to stop forever. We cover that distinction in good pain vs bad pain.

When should you see a doctor?

Get checked promptly if you have leg weakness, numbness in the groin or legs, loss of bladder or bowel control, fever with back pain, pain after a significant fall or accident, or pain that is severe or getting worse. Persistent pain beyond a few weeks is also worth a proper assessment. This article is general education, not a diagnosis.

So, are deadlifts bad for your lower back?

For most healthy lifters, no. The deadlift is a heavy, demanding hinge. The loads are large, rounding tends to creep in as the bar gets heavy, and sloppy volume or rushed progress can cause trouble. But injury surveys in powerlifters look modest, and trials in back pain show loaded training is usually tolerated and about as effective as gentler options.

Treat it as a skill, build load slowly, and keep a rep or two in the tank. If you need a structure to follow, our free pull day plan shows where hinging fits into a weekly split.