Serious injuries from chiropractic treatment are rare, but minor side effects are surprisingly common. Between 22% and 41% of patients experience some form of temporary discomfort after spinal manipulation, depending on the study design. Major adverse events occur in roughly 0.13% of cases. Understanding the difference between these two categories is key to putting the real risks in perspective.
Minor Side Effects Are Common
Studies consistently show that 30% to 55% of patients report at least one minor side effect after spinal manipulation. The most frequent complaints are increased soreness at the treatment site, stiffness, and headache. These typically appear within hours of the session and resolve on their own within a day or two. Less common reactions include fatigue, radiating discomfort, and dizziness, with nausea and dizziness each accounting for about 5% or fewer of reported symptoms.
When researchers pooled data across multiple studies, the overall rate of minor or moderate side effects landed around 41% in observational studies and 22% in randomized controlled trials. The gap likely reflects differences in how strictly symptoms are tracked and how patients are selected. Either way, some degree of post-treatment soreness is a normal and expected part of the process, similar to the muscle tenderness you might feel after a deep tissue massage or a new workout.
Serious Complications Are Rare
The major concern most people have when searching this topic is whether chiropractic adjustments can cause a stroke or serious spinal injury. The short answer: these events are extremely uncommon, but they do exist in the medical literature.
Across pooled research, major adverse events after manual therapy occur in approximately 0.13% of cases. That includes any serious complication, not just the headline-grabbing ones. For context, a large retrospective study of over 67,000 matched patients found that cauda equina syndrome, a serious compression of nerves at the base of the spine, occurred in 0.07% of patients who received chiropractic spinal manipulation. That rate was actually lower than the 0.11% seen in a comparison group who received physical therapy evaluation instead.
The Stroke Question
The most debated risk involves cervical (neck) manipulation and stroke. A stroke can occur if a vertebral or carotid artery in the neck is torn, a condition called arterial dissection. Case reports have linked this to neck adjustments, but establishing a direct cause-and-effect relationship has proven difficult.
The core problem is what researchers call “protopathic bias.” Neck pain and headache are early symptoms of an arterial dissection that’s already in progress. A person experiencing these symptoms might visit a chiropractor for relief, and the stroke that follows may have been inevitable regardless of treatment. Multiple studies have found that the association between chiropractic visits and stroke is similar to the association between primary care visits and stroke, suggesting the common factor is the neck pain that brought the patient in, not the treatment itself.
As the Canadian Medical Association Journal has noted, the risk associated with cervical manipulation is “both small and inaccurately estimated.” No screening test has been shown to reliably identify which patients are at elevated risk for post-manipulation stroke, which remains a frustrating limitation.
How Chiropractors Screen for Risk
Before performing a neck adjustment, practitioners are trained to run through a series of screening steps. These include asking about symptoms known as the “5 D’s and 3 N’s”: dizziness, difficulty swallowing, double vision, slurred speech, drop attacks, numbness, nausea, and involuntary eye movements. They also check blood pressure, perform a neurological exam, and use clinical decision rules designed to flag patients who may have cervical fractures.
A sustained positional hold of about 10 seconds is typically performed before the actual manipulation, with the practitioner watching the patient’s eyes for abnormal movements. If anything unusual comes up during this hold, the adjustment should not proceed. That said, clinical guidelines acknowledge a hard truth: no combination of screening tools can guarantee safety with certainty. Thorough clinical reasoning and a candid conversation with the patient about risks and benefits remain the most important safeguards.
Malpractice Claims as a Proxy
Another way to gauge injury frequency is through malpractice data. Washington State’s insurance commissioner reported 34 chiropractic malpractice claims over a five-year period (2019 to 2023), of which 21 resulted in a payout. The average paid claim was about $347,000. Unfortunately, because insurers don’t report the total number of practicing chiropractors or policies written, it’s impossible to calculate a true per-practitioner injury rate from this data alone. Still, the raw numbers are small compared to other medical specialties.
Putting the Risk in Context
Every medical intervention carries some risk. The relevant question isn’t whether chiropractic care is perfectly safe, but how its risks compare to the alternatives. For people with back or neck pain, the most common alternatives include over-the-counter anti-inflammatory drugs, prescription painkillers, steroid injections, and surgery. Long-term use of anti-inflammatory medications carries well-documented risks of gastrointestinal bleeding, kidney problems, and cardiovascular events. Spinal surgery carries risks of infection, nerve damage, and failed procedures requiring additional operations.
Research has found that recipients of chiropractic services have a significantly lower rate of adverse drug events, which makes sense given that the approach is non-pharmacological. For many patients with musculoskeletal pain, chiropractic care occupies a middle ground: common minor soreness after treatment, very low rates of serious harm, and no exposure to the cumulative risks of medications or surgery. The temporary stiffness and soreness that roughly a third of patients experience after an adjustment, while worth knowing about, resolves quickly and rarely affects overall satisfaction with care.