A physician, medical practitioner, medical doctor, or simply doctor is a health professional who practices medicine, which is concerned with promoting, maintaining or restoring health through the study, diagnosis, prognosis and treatment of disease, injury, and other physical and mental impairments. Physicians may focus their practice on certain disease categories, types of patients, and methods of treatment—known as specialities—or they may assume responsibility for the provision of continuing and comprehensive medical care to individuals, families, and communities—known as general practice. Medical practice properly requires both a detailed knowledge of the academic disciplines, such as anatomy and physiology, underlying diseases, and their treatment, which is the science of medicine, and a decent competence in its applied practice, which is the art or craft of the profession.

चिकित्सक वह व्यक्ति जो शिक्षित, प्रशिक्षित/ अनुभवी हो और किसी बीमारी का निदान व उपचार करता है चिकित्सक/ डाक्टर कहलाता है।( दवाओं, रोग तथा आयुर्विज्ञान का ज्ञान रखतें हैं।)