In healthcare, "DO" stands for Doctor of Osteopathic Medicine. A DO is a fully licensed physician who, like an MD (Doctor of Medicine), can diagnose and treat illnesses, prescribe medication, and perform surgery in all 50 states in the U.S.

. The key distinction of a DO is their holistic, whole-person approach to medicine. DOs focus on the interconnection of the body's systems-mind, body, and spirit-and emphasize preventive care and the body's ability to heal itself. They receive additional training in the musculoskeletal system and use osteopathic manipulative treatment (OMT), a hands-on technique to diagnose and treat conditions related to muscles, nerves, and bones.

Both DOs and MDs undergo similar medical education and residency training, and both are recognized as complete physicians. However, DOs tend to have a stronger focus on holistic care and prevention, often considering lifestyle and environmental factors in their treatment plans.

In summary, DO means Doctor of Osteopathic Medicine, a type of fully licensed physician with a distinctive holistic approach and additional training in musculoskeletal manipulation alongside conventional medical training.