Chiropractic is a healthcare discipline focused on diagnosing and treating musculoskeletal problems, particularly those involving the spine, using hands-on adjustments and other non-invasive techniques. Chiropractors hold a Doctor of Chiropractic (DC) degree, which requires a minimum of 4,410 hours of academic and clinical training. The profession is licensed and regulated in all 50 U.S. states and is one of the most commonly used forms of complementary healthcare.
Core Philosophy Behind Chiropractic
Chiropractic is built on a central idea: proper structure is necessary for proper function. If the bones of your spine shift out of alignment, become fixated, or get injured, the surrounding muscles tighten and nearby nerves can become irritated. This disrupts the nervous system’s ability to coordinate normal body processes. Chiropractors call this an “intervertebral subluxation.”
The broader philosophy holds that your body has a built-in drive toward balance, or homeostasis, where all your internal systems work in concert. Rather than introducing drugs or surgery, chiropractic aims to remove structural barriers that interfere with nerve function, allowing your body to regulate itself more effectively. This is why chiropractic relies on non-invasive approaches like manual adjustments and, in some practices, guidance on nutrition and exercise.
What Happens During an Adjustment
The defining tool of chiropractic care is spinal manipulation, often called an “adjustment.” A chiropractor uses controlled force applied to a specific joint, typically in the spine, to restore its normal movement and position. You’ll often hear a popping sound during an adjustment. That’s the release of gas bubbles from the joint fluid, not bones cracking.
Research into how this works points primarily to effects on the spinal cord’s pain-processing pathways. Spinal manipulation appears to inhibit back and neck pain partly through segmental mechanisms at the level of the spine, and potentially through peripheral mechanisms that help regulate inflammatory responses. In simpler terms, the adjustment changes the way pain signals travel through the nervous system, which is why many people feel immediate relief.
Common Techniques
Not all chiropractic adjustments look the same. There are dozens of named techniques, but two dominate everyday practice.
The Diversified technique is the most widely used. It involves a series of manual adjustments applied to different areas of the spine and other joints. Chiropractors using this method rely on a combination of hands-on examination, your health history, and sometimes X-rays to guide their work. It’s versatile and commonly used for everything from acute injuries to chronic musculoskeletal problems.
The Gonstead technique takes a more targeted approach. Practitioners use detailed spine analysis, including static and motion palpation and often X-rays, to pinpoint the exact location and nature of a misalignment before making a highly specific adjustment. This method is often preferred when you have a localized issue rather than widespread discomfort.
Some chiropractors also use instrument-assisted techniques, where a small handheld device delivers a quick, low-force impulse to the joint. This is common for patients who prefer a gentler approach or who have conditions that make traditional manual adjustments less appropriate.
Conditions With Strong Evidence
Chiropractic care has the strongest research support for spinal pain. Spinal manipulation is considered an effective option for acute, subacute, and chronic low back pain, which is the single most common reason people seek chiropractic care. It’s also effective for acute and subacute neck pain, and for chronic neck pain when combined with exercise. For acute whiplash injuries, spinal manipulation paired with exercise has shown positive results.
Beyond the spine, evidence supports chiropractic treatment for migraine headaches and cervicogenic headaches (headaches originating from neck problems). There’s also positive evidence for several extremity conditions: shoulder girdle pain, frozen shoulder, tennis elbow, hip and knee osteoarthritis, kneecap pain, and plantar fasciitis.
For non-musculoskeletal conditions, the evidence is thin. The one exception is cervicogenic dizziness, a type of dizziness caused by neck dysfunction, which has shown positive results with spinal manipulation. Claims that chiropractic can treat conditions like asthma, colic, or digestive problems lack strong clinical support.
Safety and Side Effects
Most side effects from spinal manipulation are mild and temporary. Prospective studies found that 30% to 61% of patients reported at least one side effect after treatment. The most common were headache (20%), stiffness (20%), local discomfort (15%), radiating discomfort (12%), and fatigue (12%). About 80% of these effects started within 24 hours and were moderate in severity, typically resolving on their own within a day or two.
Serious complications are rare but have been documented. More than 200 cases of serious harm have been reported in the medical literature, though these span decades and millions of treatments. Estimates from within the profession place the rate of serious events at roughly 6.4 per 10 million manipulations of the upper spine and 1 per 100 million manipulations of the lower spine. The most discussed serious risk involves manipulation of the upper neck and its potential association with stroke from vertebral artery injury. The true incidence of these events remains unknown because they are underreported, making it difficult to calculate precise risk.
Education and Licensing
Becoming a chiropractor requires completing a Doctor of Chiropractic program, which typically takes four years of graduate-level study after undergraduate prerequisites. At Southern California University of Health Sciences, for example, the program requires a minimum of 4,410 total hours, including 870 hours of foundational health sciences (anatomy, physiology, biochemistry), 1,170 hours of clinical sciences, 675 hours of chiropractic-specific clinical sciences, and 1,170 hours of hands-on clinical clerkship where students treat patients under supervision.
After graduation, chiropractors must pass national board exams and obtain a license from their state’s board of chiropractic examiners. Each state sets its own scope of practice, which determines what chiropractors can and cannot do. In most states, chiropractors can diagnose musculoskeletal conditions, order imaging, and perform adjustments, but they cannot prescribe medications or perform surgery. Ongoing continuing education is required to maintain licensure.
When Imaging Is Used
There’s an active debate within the profession about when X-rays are necessary. The prevailing evidence-based guidelines recommend against routine imaging for most patients under 65 during the first four to six weeks of care, since most people don’t present with serious underlying conditions like fractures, infections, or tumors. X-rays are considered appropriate when “red flag” symptoms suggest something more serious is going on.
Some chiropractic organizations take a different position, arguing that X-rays are part of routine practice because they help assess the biomechanics of the spine and identify subluxations. In published peer-reviewed literature, the more conservative red-flag-based approach is considered the evidence-based best practice. If a chiropractor recommends X-rays at your first visit without specific clinical reasons, it’s reasonable to ask why.
Cost Compared to Other Treatments
A systematic review of U.S. studies found that health care costs were generally lower when spine pain was managed with chiropractic care compared to medical management, both in private health plans and workers’ compensation cases. However, studies that also measured clinical outcomes found few differences in effectiveness between chiropractic and conventional treatment, and in those studies, chiropractic costs were sometimes higher. The research overall has methodological limitations, so cost comparisons should be taken as a general trend rather than a firm conclusion. Most private insurance plans and Medicare cover chiropractic adjustments, though coverage for additional services like X-rays or therapeutic exercises varies by plan.