Chiropractic care is generally safe for most adults, but it does carry real risks that vary depending on what part of the spine is being treated and your underlying health. About 55% of patients experience minor, temporary side effects like soreness or stiffness after an adjustment. Serious complications, including stroke, are rare but documented.
Common Side Effects After an Adjustment
The most frequent complaint after spinal manipulation is also the least serious. Roughly half of all patients report some kind of benign reaction afterward, most commonly pain or soreness at the treatment site, headache, and stiffness. These effects are transient, typically resolving within a day or two, and are comparable to what you might feel after a deep tissue massage or a new workout.
The Stroke Risk From Neck Adjustments
The most alarming risk associated with chiropractic care involves high-velocity manipulation of the cervical spine (the neck). An estimated 1 in 20,000 cervical manipulations results in a vertebral artery dissection, a tear in the artery wall that can lead to a stroke. The exact incidence is uncertain because many cases likely go unreported or unrecognized.
The mechanism is straightforward: the vertebral arteries run through small openings in the neck vertebrae, and rapid rotational thrusts can stretch or strain these vessel walls. In someone with a pre-existing weakness in the artery wall, this strain can cause a tear, which may trigger a blood clot that travels to the brain.
A major population-based study in Canada, however, complicated this picture. Researchers found that the increased risk of vertebrobasilar stroke was equally associated with visits to a primary care physician as with chiropractic visits. Their conclusion: people experiencing neck pain and headache from an artery dissection already in progress are likely seeking care before the stroke happens, regardless of whether they go to a chiropractor or a doctor. The study found no evidence of excess stroke risk from chiropractic care compared to primary medical care.
This doesn’t mean the risk is zero. It means separating cause from coincidence is genuinely difficult when the early symptoms of artery dissection (neck pain, headache) are the same reasons people book a chiropractic appointment in the first place.
Lower Back Adjustments Are Lower Risk
The most feared complication of lumbar spine manipulation is cauda equina syndrome, a rare condition where the bundle of nerves at the base of the spinal cord becomes severely compressed, potentially causing bowel or bladder dysfunction and leg weakness. A large retrospective study of U.S. academic health centers found that cauda equina syndrome occurred in 0.07% of patients who received spinal manipulation, compared to 0.11% of patients who received physical therapy evaluation without manipulation. In other words, the rate was actually 40% lower in the chiropractic group.
Notably, both groups showed the highest rates of cauda equina syndrome in the first two weeks after seeking care. This suggests that patients who develop the condition often already have a serious underlying problem when they first walk through the door, regardless of which provider they visit.
How It Compares to Other Treatments
Risk makes more sense in context. A study of over 291,000 Medicare beneficiaries with new neck pain found that those managed with chiropractic care had a 20% lower rate of adverse outcomes compared to patients treated with prescription drug therapy, and a 14% lower rate compared to primary care without drugs. The prescription drug therapy group had the highest risk of any measured adverse outcome across all three groups.
This aligns with what’s known about alternatives. NSAIDs like ibuprofen and naproxen carry risks of gastrointestinal bleeding, kidney damage, and cardiovascular events, particularly with long-term use. Opioids carry addiction risk. Spinal surgery carries risks of infection, nerve damage, and failed back surgery syndrome. Chiropractic manipulation is not risk-free, but for uncomplicated musculoskeletal pain, its safety profile compares favorably to many standard medical interventions.
Who Should Avoid Chiropractic Care
Certain conditions make spinal manipulation genuinely dangerous. These include spinal fractures, bone cancers or tumors that have spread to the spine, active spinal infections, severe osteoporosis, and inflammatory conditions that weaken bone or connective tissue. Patients on blood-thinning medications face higher risk from any vascular injury, however small.
A competent chiropractor screens for these “red flags” before treatment. Clinicians use over 160 documented signs and symptoms to identify serious spinal pathology, including a thorough patient history and physical exam looking for unexplained weight loss, fever, neurological changes, spine tenderness, and altered sensation. If you have any of these conditions and a chiropractor doesn’t ask about them before adjusting you, that’s a provider problem, not just a technique problem.
The Safety Question for Children
Roughly 8% of chiropractic patients worldwide are under 18, and about 13% of visits at some practices involve children. The evidence on safety for this group is thin. A rapid review of the research found that the risk of moderate and severe adverse events in children under 10 is simply unknown. Previous systematic reviews identified case reports of serious complications including temporary paraplegia and death, though these appear to be extremely rare.
One study of infants treated with gentle mobilization techniques (far less forceful than standard adult adjustments) reported no moderate or severe adverse events, though mild vegetative responses like flushing (17.8%), brief breathing pattern changes (9.2%), and temporary hyperextension (4.3%) were observed. The lack of large-scale safety data for pediatric patients is itself a concern. For children, the evidence base supporting both the benefits and the safety of spinal manipulation remains limited.
What a Safe Visit Looks Like
Both the American Chiropractic Association and the International Chiropractic Association endorse informed consent as a legal and ethical requirement before treatment. A thorough consent process covers the planned procedure, alternative treatments, material risks (including the possibility of stroke for cervical manipulation), and an opportunity for you to ask questions.
In practice, informed consent requirements vary widely by state, and few jurisdictions specify exactly what must be disclosed. Oregon and North Carolina have the most comprehensive requirements. If your chiropractor doesn’t discuss risks before your first neck adjustment, ask directly about the possibility of arterial injury. A practitioner who dismisses the question or claims there are no risks is not someone you want manipulating your spine.
Red flags for an unsafe practitioner include skipping the initial health history and physical exam, not asking about prior surgeries or medications, recommending long prepaid treatment packages before assessing your response, and using cervical manipulation for conditions unrelated to neck pain or headache. Chiropractors who take X-rays, review your history, screen for contraindications, and explain what they’re doing and why are following the standard of care that keeps serious complications rare.