More than a century after the first chiropractic adjustment, millions of Americans continue to seek chiropractic care. But what actually happens during an adjustment, what does the research support, and where does chiropractic belong in a modern approach to health and wellness?
The sound is unmistakable.
A patient lies on a padded table. A practitioner positions the body, applies a quick controlled movement, and there it is: a pop.
For some patients, that sound is associated with relief. For others, it is the very reason they are nervous about visiting a chiropractor. And across social media, videos of dramatic adjustments have turned chiropractic care into something of a spectacle.
But the sound is only a very small part of the story.
Chiropractic is a licensed health care profession used by millions of Americans, most commonly for pain. According to the National Center for Complementary and Integrative Health, 11 percent of American adults reported using chiropractic care in 2022, compared with 7.4 percent in 2002. Among adults who used chiropractic care, 85.7 percent said they used it for pain management.
Its popularity has grown alongside public interest in approaches to health that may reduce reliance on medication, address movement and function, and incorporate physical therapy, exercise, nutrition, stress management, and other wellness practices.
Yet chiropractic also occupies an unusual place in health care. There is legitimate scientific evidence supporting some of its uses. There are also claims associated with chiropractic that research has not established.
Understanding the difference matters.
What Is Chiropractic Care?
Chiropractic is a health profession primarily concerned with the musculoskeletal system, particularly the spine, muscles, joints, and related structures.
Its best known treatment is spinal manipulation, commonly referred to by chiropractors as an adjustment.
During spinal manipulation, a practitioner uses their hands or a device to apply a controlled force to a spinal joint. The amount of force and technique can vary. Some adjustments involve a quick thrust, while other forms of manual care use slower movement, stretching, mobilization, or pressure.
Chiropractic care can also include exercise recommendations, stretching, posture education, ergonomic guidance, lifestyle counseling, and other approaches to improving movement and physical function.
And despite the public association between chiropractors and the spine, the profession is not limited to simply “cracking backs.”
Chiropractors assess patients, collect health histories, perform physical examinations, evaluate musculoskeletal complaints, develop care plans, monitor progress, and refer patients to other health professionals when appropriate.
Who Is a Chiropractor?
In the United States, chiropractors are licensed health professionals who typically earn a Doctor of Chiropractic degree.
According to the United States Bureau of Labor Statistics, completing a Doctor of Chiropractic program generally requires approximately four years of professional education after at least three years of undergraduate study. Chiropractic education includes anatomy, physiology, biology, spinal assessment, diagnostic training, adjustment techniques, and supervised clinical experience.
Every state requires chiropractors to be licensed, although the exact scope of practice varies by state.
A Doctor of Chiropractic is not the same credential as a Doctor of Medicine or Doctor of Osteopathic Medicine. The professions have different educational pathways, legal scopes, and approaches to care.
Chiropractors are also not the only professionals who may perform spinal manipulation. Some osteopathic physicians and physical therapists use forms of manipulation or mobilization as part of their clinical practice.
That distinction is important because spinal manipulation is a treatment technique. Chiropractic is a profession.
When Did Chiropractic Begin?
Modern chiropractic dates to 1895.
Daniel David Palmer is generally credited with performing what the chiropractic profession identifies as its first adjustment on September 18, 1895, in Davenport, Iowa. He later established a chiropractic school in 1897.
The origin story is also one of the first places where chiropractic history and modern scientific scrutiny intersect.
Palmer reportedly believed that a spinal adjustment had restored the hearing of a man named Harvey Lillard. The story became part of chiropractic history, but it should not be interpreted as modern evidence that spinal manipulation can treat hearing loss.
Early chiropractic philosophy proposed that disturbances in the spine could interfere with the nervous system and contribute to disease elsewhere in the body.
More than 130 years later, chiropractic has evolved considerably, and there is no single philosophy shared by every chiropractor.
Many contemporary chiropractors focus primarily on musculoskeletal pain, mobility, physical function, rehabilitation, and evidence informed care.
Others continue to use broader theories about spinal “subluxations” and their effects on general health.
That difference within the profession helps explain why two patients can walk into two chiropractic offices and receive very different explanations of what chiropractic is supposed to accomplish.
What Does “Alignment” Actually Mean?
“Alignment” is one of the most familiar words in chiropractic marketing, but it can also be one of the most misunderstood.
The popular image is simple: a vertebra moves out of place, presses on something important, and an adjustment puts it back where it belongs.
Human anatomy is more complicated.
In conventional medicine, a subluxation generally refers to a partial dislocation of a joint. In some chiropractic traditions, however, the word has historically been used more broadly to describe spinal dysfunction believed to interfere with nervous system function or general health.
Scientific evidence has not established that these broader chiropractic subluxations are a cause of disease throughout the body, or that routinely correcting them prevents disease.
A systematic review examining chiropractic care as a means of preventing diseases outside the musculoskeletal system found no clinical evidence supporting chiropractic treatment as a general disease prevention strategy.
That does not mean spinal manipulation has no value.
It means the evidence supporting treatment for certain musculoskeletal problems should not automatically be extended into claims about treating unrelated diseases.
Those are two different questions.
How Does an Adjustment Work?
During a typical spinal manipulation, a joint is moved using a controlled force. This can temporarily affect joint movement, muscle activity, sensory input, pain perception, and how a person moves afterward.
The exact mechanisms responsible for pain relief are still being studied. It is unlikely that every benefit comes from a single mechanical event.
What about the famous popping sound?
It is not a bone snapping back into position.
Joint manipulation can create rapid changes in pressure within a joint, resulting in a phenomenon commonly associated with gas within the joint fluid. Similar sounds can occur when people crack their knuckles.
And an adjustment does not have to produce a dramatic sound to have an effect.
The sound itself therefore should not be treated as proof that an adjustment “worked.”
The more meaningful questions are whether pain improves, movement becomes easier, function changes, the improvement lasts, and the treatment helps the patient accomplish an agreed upon health goal.
Why Do People Seek Chiropractic Care?
Pain remains the primary reason.
Back pain is especially significant. The World Health Organization describes low back pain as a major health problem worldwide, affecting mobility, quality of life, work, sleep, mental health, and participation in everyday activities.
For some people, chiropractic offers a nondrug option for managing that pain.
The evidence is not that spinal manipulation cures back pain. Research instead suggests that it can provide modest improvements in pain and physical function for some patients.
The National Center for Complementary and Integrative Health reports that spinal manipulation may produce small improvements in pain and function for people with chronic low back pain and modest improvement in some cases of acute low back pain.
That places manipulation among several possible tools rather than above all others.
The American College of Physicians has included spinal manipulation among several nondrug options clinicians may consider for low back pain. The World Health Organization likewise says spinal manipulative therapy may be offered as part of care for adults with chronic primary low back pain.
The phrase “part of care” is important.
Exercise, rehabilitation, education, psychological approaches, physical activity, sleep, general health, and other treatments may also be relevant. WHO specifically encourages a person centered approach that considers physical, psychological, and social factors rather than relying on a single intervention.
What About Neck Pain and Headaches?
This is where the evidence becomes less straightforward.
Chiropractic care is frequently sought for neck pain and headaches, but evidence varies according to the condition, treatment technique, and patient.
For headaches, the National Center for Complementary and Integrative Health says research on spinal manipulation remains limited or inconsistent, making firm conclusions difficult.
That is an example of why the phrase “chiropractic helps headaches” can be too broad.
There are many different kinds of headaches, with different causes and different treatments.
The same principle applies across health care.
A symptom is not always a diagnosis.
What About the Nervous System?
The relationship between the spine and nervous system is real.
The spinal cord travels through the spinal column, nerves communicate information throughout the body, pain is processed through the nervous system, and musculoskeletal problems can affect movement, sensation, and function.
But that basic anatomy does not prove every claim made about chiropractic and the nervous system.
Research continues into how spinal manipulation influences sensory processing, pain responses, muscle function, and other neurological mechanisms.
There is a considerable difference, however, between saying manipulation interacts with the nervous system and saying that an adjustment treats nearly every health problem because the nervous system controls the body.
The first statement describes anatomy and an active area of research.
The second requires clinical evidence for each health claim.
Can Chiropractic “Boost” the Immune System?
Current evidence does not support that claim.
A systematic review published in JAMA Network Open examined research involving spinal manipulative therapy, infectious disease, immune outcomes, and biological markers.
Researchers found no clinical evidence showing that spinal manipulation prevents infectious disease or improves immune function in a clinically meaningful way. Some studies identified short term changes in certain biological markers, but the clinical importance of those changes remains unknown.
This distinction is central to responsible health education.
A treatment can cause measurable changes in the body without those changes necessarily preventing disease, strengthening immunity, or improving long term health outcomes.
Where Does Chiropractic Fit Into Overall Wellness?
Perhaps the most useful way to think about chiropractic is not as a replacement for conventional medicine, and not as a cure for every condition.
It can be one component of care.
Someone whose back pain makes walking difficult may become more active if treatment helps reduce discomfort. Someone experiencing stiffness may benefit from a plan that combines manual therapy with exercise and movement. Someone whose work environment contributes to recurring discomfort may need ergonomic changes in addition to hands on treatment.
Those changes can matter to overall wellness.
But the broader health benefit may come from helping the individual move, sleep, exercise, work, and participate in daily life more comfortably rather than from the adjustment independently preventing disease.
Good chiropractic care may therefore extend beyond what happens on the treatment table.
Exercise matters.
Movement matters.
Nutrition matters.
Sleep matters.
Mental and emotional health matter.
Preventive screenings matter.
Primary medical care matters.
And communication between health professionals matters.
Wellness is not created by one intervention.
Is Chiropractic Care Safe?
For most people receiving appropriately selected spinal manipulation from a trained and licensed professional, reported side effects are generally temporary.
Soreness, stiffness, increased discomfort, tiredness, or headache can occur after treatment and often resolve quickly.
Serious complications have also been reported, although they are considered rare.
Neck manipulation deserves particular attention because cervical artery dissection and stroke have been reported following manipulation. Determining causation and calculating the exact level of risk is difficult.
One reason is that an arterial dissection itself can initially cause neck pain or headache, meaning some people may seek treatment for symptoms of a dissection that has already begun.
Research examining cervical manipulation has not established a simple causal relationship, but researchers also caution that randomized clinical trials generally are not large enough to detect extremely rare serious events.
That uncertainty should not be sensationalized.
It also should not be ignored.
Patients should provide an accurate medical history, discuss existing conditions and medications, ask about the proposed technique, and understand alternatives before treatment.
A competent practitioner should also recognize when a patient needs medical evaluation rather than manipulation.
When Should Chiropractic Not Be the First Stop?
Pain can be musculoskeletal.
It can also be a warning sign.
Persistent or severe symptoms, significant weakness, numbness, unexplained neurological changes, major trauma, or symptoms suggesting serious illness require appropriate medical evaluation.
The question should never simply be, “Can this be adjusted?”
The better question is, “What is causing this symptom, and what kind of care does this person need?”
That principle applies to every health profession.
Chiropractors are expected to evaluate their patients and refer to other health professionals when necessary.
What Should You Ask Before Choosing a Chiropractor?
Patients should feel comfortable asking questions before consenting to treatment.
Ask what the chiropractor believes is causing your symptoms. Ask what treatment is being recommended and why. Ask what evidence supports the approach. Ask whether exercises or changes at home should accompany treatment. Ask how improvement will be measured. Ask how long a trial of treatment should reasonably take before the plan is reconsidered.
It is also reasonable to ask whether neck manipulation will be performed and whether gentler alternatives are available.
Most importantly, listen to the explanation.
A practitioner should be able to explain care without promising cures, frightening you into treatment, or suggesting that you need indefinite adjustments to remain healthy.
The Bigger Question: Does Chiropractic Work?
There may never be a responsible one word answer to that question.
“Does surgery work?”
“Does medication work?”
“Does physical therapy work?”
Each question is incomplete until we know the condition, the treatment, the patient, the outcome being measured, and the quality of the evidence.
Chiropractic deserves the same scrutiny.
For some musculoskeletal conditions, particularly low back pain, spinal manipulation has enough evidence to be included among recognized treatment options.
For other conditions, evidence is limited, mixed, or absent.
And claims that chiropractic adjustments broadly prevent disease, strengthen immunity, or treat unrelated medical illnesses should not be presented as established fact.
That distinction does not weaken chiropractic care.
It helps patients understand where it may actually be useful.
The Bottom Line
More than a century after Daniel David Palmer performed the adjustment that launched a profession, chiropractic remains both widely used and frequently debated.
Its future may depend less on defending every claim made in its name and more on clearly identifying where it contributes to patient care.
For people living with certain forms of back pain, stiffness, mobility limitations, and other musculoskeletal concerns, chiropractic care may provide another option within a larger health plan.
But an adjustment is not a substitute for preventive medicine, appropriate screenings, exercise, nutrition, mental health care, or medical treatment when illness is present.
And the sound of an adjustment should never speak louder than the evidence.
Health care works best when patients understand what a treatment can do, what it cannot yet be shown to do, what its risks are, and why it is being recommended.
That is not skepticism for skepticism’s sake.
That is informed health care.
Sources and Further Reading
- National Center for Complementary and Integrative Health. “Spinal Manipulation: What You Need to Know.” National Institutes of Health.
- National Center for Complementary and Integrative Health. “Chiropractic: In Depth.” National Institutes of Health.
- National Center for Complementary and Integrative Health. “Headaches: What You Need to Know.” National Institutes of Health.
- World Health Organization. “Low Back Pain.” WHO Fact Sheet.
- World Health Organization. “WHO Guideline for Non Surgical Management of Chronic Primary Low Back Pain in Adults in Primary and Community Care Settings.” 2023.
- Qaseem, Amir, Timothy J. Wilt, Robert M. McLean, and Mary Ann Forciea. “Noninvasive Treatments for Acute, Subacute, and Chronic Low Back Pain: A Clinical Practice Guideline From the American College of Physicians.” Annals of Internal Medicine, 2017.
- Chow, Ngai, et al. “Assessment of Studies Evaluating Spinal Manipulative Therapy and Infectious Disease and Immune System Outcomes: A Systematic Review.” JAMA Network Open, 2021.
- Goncalves, Guillaume, Christine Le Scanff, and Charlotte Leboeuf Yde. “Effect of Chiropractic Treatment on Primary or Early Secondary Prevention: A Systematic Review With a Pedagogic Approach.” Chiropractic & Manual Therapies, 2018.
- Pankrath, Natalie, Svenja Nilsson, and Nikolaus Ballenberger. “Adverse Events After Cervical Spinal Manipulation: A Systematic Review and Meta Analysis of Randomized Clinical Trials.” Pain Physician, 2024.
- U.S. Bureau of Labor Statistics. “Chiropractors.” Occupational Outlook Handbook.
- Cleveland Clinic. “Chiropractic Adjustment Care, Treatment & Benefits.”
- American Chiropractic Association. “Origins and History of Chiropractic.”
Editorial Note
This article is intended for educational purposes and should not be considered medical advice. Chiropractic care may be appropriate for some individuals and conditions but may not be appropriate for others. Patients should discuss symptoms, medical history, treatment options, potential benefits, and potential risks with qualified health care professionals before beginning a new form of care.
