Chiropractic care is generally safe for most adults. About 55% of patients experience some kind of mild reaction during a course of treatment, but serious complications are rare. The most common side effects are temporary soreness, headache, and tiredness, and 85% of all reported reactions are mild or moderate. Like any physical treatment, though, chiropractic carries specific risks that depend on your health history, the area being treated, and the technique used.
Common Side Effects After an Adjustment
The most frequently reported reaction to spinal manipulation is local discomfort at the treatment site, occurring in about 53% of patients over a series of visits. Headache follows at around 12%, tiredness at 11%, and radiating discomfort (pain that spreads from the adjustment site) at 10%. These reactions typically appear within hours of treatment and resolve on their own within a day or two. Think of it like the soreness you feel after a workout your body isn’t used to.
The “Popping” Sound Is Not Bones Cracking
The cracking or popping sound during an adjustment comes from gas behavior inside your joints, not from anything breaking. When the chiropractor applies a quick thrust, the joint surfaces separate rapidly, causing a pressure drop in the fluid between them. Dissolved gas comes out of solution and forms a bubble or cavity, producing the sound. Researchers have debated whether the noise comes from the bubble forming or collapsing, and the answer may involve both processes happening at once.
Either way, four separate studies have found that the popping sound has no relationship to clinical outcomes. Whether or not you hear a pop doesn’t predict whether the treatment will help your pain or improve your mobility.
Serious Risks: Stroke and Nerve Damage
The most discussed serious risk is vertebral artery dissection, a tear in the artery running through the neck that can lead to stroke. The estimated rate is roughly 1 in 20,000 spinal manipulations, though the exact incidence remains uncertain because these events are difficult to track. This risk applies specifically to neck (cervical) manipulation, not adjustments to the mid or lower back.
For the lower back, the primary serious concern is cauda equina syndrome, a condition where nerves at the base of the spine become severely compressed, potentially causing leg weakness and loss of bladder or bowel control. A retrospective study of US academic health centers found that the incidence of cauda equina syndrome in patients who received spinal manipulation was actually lower (0.07%) than in patients who received physical therapy evaluation alone (0.11%). This suggests that lower back manipulation does not appear to increase the risk of this complication.
How It Compares to Pain Medication
One way to put these risks in context is to compare them with common alternatives. A risk assessment comparing cervical manipulation to NSAIDs (over-the-counter anti-inflammatory drugs like ibuprofen and naproxen) for neck pain found that NSAIDs pose a significantly greater risk of serious complications and death, potentially by a factor of several hundred. NSAIDs carry well-documented risks of gastrointestinal bleeding, kidney damage, and cardiovascular events, especially with regular use. Neither treatment was shown to be more effective than the other for neck pain specifically.
Who Should Avoid Chiropractic Care
Certain conditions make spinal manipulation genuinely dangerous. You should not receive chiropractic adjustments, or should get medical clearance first, if you have:
- Severe osteoporosis or fragile bones: Weakened bones can fracture under the force of manipulation.
- Cancer that has spread to the spine: Bones compromised by metastatic cancer are vulnerable to injury during manual adjustments.
- Unassessed recent trauma: Hidden fractures or internal injuries from an accident or fall could worsen with manipulation before they’ve been properly diagnosed.
- Neurological warning signs: Numbness or tingling in your arms or legs, leg weakness, or loss of bladder or bowel control may indicate spinal cord compression that needs immediate medical evaluation.
- Active spinal infections or inflammatory flare-ups: Conditions like rheumatoid arthritis or ankylosing spondylitis in an active phase can be aggravated by manipulation.
- Serious cardiovascular conditions: Uncontrolled high blood pressure, recent heart events, or aneurysms warrant caution, particularly with neck adjustments that may affect circulation.
Safety During Pregnancy
Chiropractic care is typically safe during pregnancy, and many pregnant people seek it for lower back and pelvic pain. Chiropractors use modified techniques and specialized tables with adjustable abdominal sections to accommodate a growing belly, especially after the fifth month. Positioning changes, such as elevating the head and shoulders when lying face-up, help avoid cardiovascular stress.
There are specific pregnancy situations where chiropractic is not appropriate: vaginal bleeding, ruptured membranes, premature labor, sudden pelvic pain, placenta previa or abruption, ectopic pregnancy, and moderate to severe toxemia. Electrical stimulation, therapeutic ultrasound, and X-rays should also be avoided entirely during pregnancy.
Safety for Children
Pediatric chiropractic uses different techniques than adult care. Rather than the high-velocity thrusts applied to adults, most approaches for children involve gentle, low-force methods. A 2015 review of 31 studies found that serious adverse events in infants and children receiving chiropractic care are rare, with no reported deaths.
That said, significant adverse events have been documented in pediatric patients, including severe headache, mid-back soreness, and in very rare cases, more serious neurological complications. Another concern raised in the research is the potential for delayed diagnosis when parents seek chiropractic care for a child with a condition that actually requires medical treatment. For young children, it’s worth ensuring that any serious symptoms have been evaluated by a pediatrician before starting chiropractic care.
Training and Licensing Standards
In the United States, chiropractors complete a Doctor of Chiropractic program requiring a minimum of 4,200 instructional hours, which includes coursework in anatomy, physiology, radiology, and diagnosis alongside supervised clinical training. After graduation, they must pass national board exams and obtain a state license to practice. This level of training is designed to ensure that chiropractors can identify red flags and refer patients out when manipulation isn’t appropriate.
Your safety is influenced not just by chiropractic care in general but by the specific provider you see. A chiropractor who takes a thorough health history, orders imaging when needed, and communicates clearly about what they’re doing and why is practicing the way the profession is designed to work. If a chiropractor dismisses your concerns, skips the intake process, or recommends long treatment plans before assessing your response to the first few visits, those are reasons to look elsewhere.