Chiropractic medicine is a healthcare profession focused on diagnosing and treating musculoskeletal problems, particularly in the spine, through hands-on adjustments and other manual therapies. An estimated 35 million Americans visit a chiropractor each year, most commonly for back pain, neck pain, joint pain, and headaches. Practitioners hold a Doctor of Chiropractic (DC) degree and are licensed in all 50 states.
The Core Idea Behind Chiropractic Care
The profession dates back to September 18, 1895, when Daniel David Palmer performed the first chiropractic adjustment in Davenport, Iowa. Palmer’s reasoning was straightforward: the body has a natural capacity to heal, that healing power travels through the nervous system, and when spinal joints are misaligned, they can interfere with nerve function. He called these misalignments “subluxations” and developed a procedure for correcting them by adjusting the vertebrae.
That foundational idea still shapes chiropractic today, though it has evolved. The International Chiropractors Association defines the profession as dealing with the relationship between the skeleton’s joints and the nervous system, and the role that relationship plays in maintaining health. Modern neuroscience research has shown that even light pressure on nerve fibers affects how they transmit signals, lending biological plausibility to the concept. That said, subluxation remains more of a clinical framework than a precisely measurable condition. Researchers have not been able to quantify it the way you might measure a broken bone on an X-ray. In practice, chiropractors identify areas of restricted joint movement, pain, or muscle tension and work to correct them.
What Chiropractors Study
Becoming a chiropractor requires completing a doctoral program that typically runs four academic years after undergraduate education. At Southern California University of Health Sciences, for example, the Doctor of Chiropractic program requires a minimum of 4,410 total hours, including at least 1,170 hours of supervised clinical training with real patients.
The coursework covers much of the same foundational science as medical school: anatomy, physiology, biochemistry, neuroscience, pathology, and immunology. Students also take clinical courses in physical examination, differential diagnosis, clinical neurology, pharmacology, X-ray interpretation, and emergency procedures. The key difference from medical school is the emphasis on spinal biomechanics, manual adjustment techniques, and rehabilitation strategies rather than surgery or prescription medication.
What Happens During an Adjustment
Chiropractors use several distinct techniques, and the one your practitioner chooses depends on your condition, age, and comfort level.
- Diversified Technique: The most common approach. The chiropractor uses their hands to deliver a quick, precise thrust to a specific joint. This often produces a popping sound, which is simply gas releasing from the joint fluid. It’s popular among athletes and active adults for restoring range of motion.
- Activator Method: A gentler alternative using a small handheld instrument that delivers a quick, light impulse to the targeted area. Because it avoids twisting or heavy pressure, it’s often used for elderly patients, children, and people with arthritis.
- Gonstead Technique: A highly specific method involving detailed analysis to pinpoint exact problem areas. The chiropractor positions you carefully before delivering a controlled thrust. It’s often used for chronic, stubborn pain patterns.
- Thompson Drop Table: Uses a specialized table with sections that lift slightly and then drop during the adjustment. The table absorbs some of the force, making the correction smoother. This technique works well for people who can’t tolerate twisting, including pregnant women in later trimesters.
- Flexion-Distraction: Designed for disc problems and sciatica. You lie face-down on a table that gently bends and stretches the spine in a rhythmic motion while the chiropractor guides the movement, reducing pressure on discs and nerves.
What the Evidence Says About Effectiveness
The strongest research support for chiropractic care is in treating spinal pain, especially low back pain. A meta-analysis found that spinal manipulation reduced acute low back pain by about 9.9 points on a 100-point scale, compared to 8.4 points for anti-inflammatory drugs like ibuprofen. The improvements are modest but real, and they come without the gastrointestinal side effects that long-term use of anti-inflammatories can cause.
For chronic low back pain, data pooled from 47 randomized controlled trials showed that spinal manipulation provides improvements in pain and disability similar to those from exercise and physical therapy. A separate analysis found moderate-quality evidence that manipulation significantly reduces both pain and disability in chronic low back pain patients compared to exercise and physical therapy alone.
Neck pain also responds well. One analysis found a standardized effect of -0.73 in favor of manipulation for neck pain intensity immediately after treatment, which is considered a moderate to large benefit. For low back pain measured over weeks rather than immediately after a session, the benefit was smaller but still statistically significant.
Diagnostic Tools and Scope of Practice
Chiropractors are not limited to just feeling your spine with their hands. In virtually every U.S. jurisdiction, they can perform orthopedic examinations, neurological examinations, and extremity examinations without any additional certification. They can take and interpret full-spine X-rays in nearly all states, and they can order advanced imaging like MRIs and CT scans.
The scope of practice varies somewhat by state. Some jurisdictions allow chiropractors to perform diagnostic ultrasound, surface electromyography (a test that measures muscle electrical activity), and certain lab analyses. What chiropractors cannot do in any state is prescribe pharmaceutical drugs or perform surgery. Their treatment toolkit centers on manual therapies, rehabilitation exercises, lifestyle counseling, and supportive devices like orthotics and spinal braces.
Safety and Who Should Avoid It
For most people, chiropractic adjustments are safe. The most common side effects are temporary soreness, stiffness, or mild discomfort in the treated area, similar to what you might feel after a workout. Serious complications are rare. A large study of older adults with neck pain found that the incidence of stroke was extremely low in both chiropractic patients and primary care patients. At seven days after a visit, the stroke rate was actually slightly lower for chiropractic patients (1.2 per 1,000) than for those who saw a primary care physician (1.4 per 1,000).
However, certain conditions make forceful spinal manipulation unsafe. Severe osteoporosis is a clear contraindication because weakened bones can fracture under pressure. Inflammatory joint diseases like rheumatoid arthritis, ankylosing spondylitis, and psoriatic arthritis require modified, gentler techniques or may rule out manipulation of certain areas entirely. Other red flags include spinal tumors or cancer that has spread to the spine, bone infections, fractures, joint instability, clotting disorders, and disc herniations that are causing progressive neurological symptoms like worsening numbness or weakness. Neck adjustments specifically carry additional caution for people with blood vessel problems affecting the arteries that run through the cervical spine.
A responsible chiropractor will screen for these conditions before beginning treatment, typically through a health history, physical examination, and imaging when warranted.
Insurance and Cost
Medicare Part B covers manual spinal manipulation by a chiropractor to correct a subluxation. After meeting your annual deductible, you pay 20% of the Medicare-approved amount. Notably, Medicare does not cover other services a chiropractor might provide or order, including X-rays, massage therapy, and acupuncture. Most private insurance plans also cover chiropractic care to some degree, though the number of covered visits per year and copay amounts vary widely by plan. If you’re paying out of pocket, individual sessions typically range from $30 to $200 depending on your location and the complexity of treatment.