DO stands for Doctor of Osteopathic Medicine. A DO is a fully licensed physician who can practice medicine, perform surgery, and prescribe medication, just like an MD (Doctor of Medicine). The United States has over 167,000 practicing DOs, and that number is growing fast, with nearly 40,000 osteopathic medical students currently in training.
If you’ve seen “DO” after a doctor’s name and wondered whether they’re a “real” doctor, the short answer is yes. DOs complete four years of medical school, pass national licensing exams, and train in residency programs alongside MDs. The differences are real but narrower than most people assume.
How DO Training Differs From MD Training
Both DOs and MDs attend four-year medical schools, study the same core sciences (anatomy, pharmacology, pathology, biochemistry), and complete hands-on clinical rotations in hospitals and clinics. The key difference is that DO students attend osteopathic medical schools, where they receive additional training in the musculoskeletal system and a hands-on technique called osteopathic manipulative treatment (OMT). This adds roughly 200 extra hours of coursework focused on how the body’s structure, particularly bones, muscles, and connective tissue, relates to overall health.
After medical school, DOs and MDs now train in the same residency programs. Since 2020, the U.S. has operated under a single accreditation system for all residency and fellowship programs, meaning DO and MD graduates apply to the same positions and are held to the same standards. Some residency programs carry a special “Osteopathic Recognition” designation, which means they integrate osteopathic principles into the curriculum, but these programs are open to all graduates.
Licensing and Board Certification
DOs take the COMLEX-USA, a three-part licensing exam designed specifically for osteopathic physicians. MDs take the USMLE. Both exams test the medical knowledge and clinical skills needed to practice independently. Many DO students actually take both exams to keep their residency options as wide as possible, and most residency programs accept either one.
Once licensed, a DO holds the same legal authority as an MD in all 50 states. They can prescribe controlled substances, admit patients to hospitals, order imaging and lab work, and lead surgical teams. Internationally, DOs have full practice rights in more than 65 countries.
The Osteopathic Philosophy
Osteopathic medicine is built on four core principles that guide how DOs approach patient care. The first is that the body is a unit of body, mind, and spirit, meaning a DO is trained to consider how emotional stress or lifestyle factors might contribute to physical symptoms. The second is that the body is capable of self-regulation and self-healing, so treatment often focuses on removing barriers to the body’s own recovery. The third is that structure and function are connected: a misaligned joint or tight muscle can affect organ function and overall well-being. The fourth follows from the other three: rational treatment should account for all of these relationships rather than targeting symptoms in isolation.
In practice, this means DOs tend to spend more time evaluating how different body systems interact. A DO treating chronic headaches, for example, might examine posture, neck alignment, and jaw tension alongside the standard neurological workup.
What Osteopathic Manipulative Treatment Looks Like
OMT is the most visible skill that sets DOs apart. It involves using the hands to diagnose and treat structural problems in the body. During a session, your doctor applies gentle pressure to stretch muscles, move joints into proper alignment, and release tension in soft tissues. Some techniques use slow, sustained pressure while others involve quicker, more targeted movements. Popping or thrust-based adjustments are possible but used less frequently than a chiropractor would.
The range of conditions treated with OMT is broader than you might expect. It’s commonly used for lower back pain, neck pain, and migraines, but DOs also apply it for:
- Breathing issues like asthma and sinus infections
- Digestive problems like irritable bowel syndrome and constipation
- Chronic pain conditions including fibromyalgia and arthritis
- Pregnancy-related discomfort such as swelling, insomnia, and sciatica
- Sports and repetitive stress injuries like carpal tunnel syndrome
Not every DO uses OMT regularly. A DO who specializes in cardiology or psychiatry may rarely perform hands-on manipulation, while a DO in family medicine or sports medicine might use it daily. It’s one tool in the toolkit, not a requirement for every visit.
What Specialties Can a DO Practice?
DOs can specialize in every field of medicine, from dermatology and orthopedic surgery to emergency medicine and oncology. Because they now train in the same accredited residency programs as MDs, there is no specialty closed off to a DO graduate. That said, DOs are disproportionately represented in primary care fields like family medicine, internal medicine, and pediatrics. This partly reflects the osteopathic emphasis on whole-person care, and partly reflects historical patterns in how osteopathic schools recruited and trained students.
There is also a specialty unique to osteopathic medicine: neuromusculoskeletal medicine. Physicians in this field focus specifically on diagnosing and treating conditions through OMT and musculoskeletal expertise.
Choosing Between a DO and an MD
For most patients, the practical difference between seeing a DO and an MD is minimal. Both can diagnose conditions, order tests, prescribe the same medications, and perform the same procedures. The quality of your care depends far more on the individual doctor’s training, experience, and communication style than on which degree they hold.
Where the distinction matters most is if you’re specifically interested in a hands-on, musculoskeletal approach to your health. If you deal with chronic pain, recurring muscle tension, or conditions where structural alignment plays a role, a DO who actively practices OMT can offer something an MD typically cannot. If you’re seeing a specialist for a specific organ system or surgical problem, the letters after the name are unlikely to change your experience in any meaningful way.