medicine medicine medicine is the science and practice of caring for a patient, managing the diagnosis, prognosis, prevention, treatment, palliation of their injury or disease, and promoting their health. medicine encompasses a variety of health care practices evolved to maintain and restore health by the prevention and treatment of illness. contemporary medicine applies biomedical sciences, biomedical research, genetics, and medical technology to diagnose, treat, and prevent injury and disease, typically through pharmaceuticals or surgery, but also through therapies as diverse as psychotherapy, external splints and traction, medical devices, biologics, and ionizing radiation, amongst others. this article is about the science of healing. for medicaments, see medication. for other uses, see medicine (disambiguation). medicinestatue of asclepius, the greek god of medicine, holding the symbolic rod of asclepius with its coiled serpentspecialistmedical specialtyglossaryglossary of medicine medicine has been practiced since prehistoric times, and for most of this time it was an art (an area of creativity and skill), frequently having connections to the religious and philosophical beliefs of local culture. for example, a medicine man would apply herbs and say prayers for healing, or an ancient philosopher and physician would apply bloodletting according to the theories of humorism. in recent centuries, since the advent of modern science, most medicine has become a combination of art and science (both basic and applied, under the umbrella of medical science). for example, while stitching technique for sutures is an art learned through practice, the knowledge of what happens at the cellular and molecular level in the tissues being stitched arises through science. prescientific forms of medicine, now known as traditional medicine or folk medicine, remain commonly used in the absence of scientific medicine, and are thus called alternative medicine. alternative treatments outside of scientific medicine with safety and efficacy concerns are termed quackery. etymology medicine (uk: /ˈmɛdsɪn/ (listen), us: /ˈmɛdɪsɪn/ (listen)) is the science and practice of the diagnosis, prognosis, treatment, and prevention of disease. the word "medicine" is derived from latin medicus, meaning "a physician". clinical practice the doctor by sir luke fildes (1891) elizabeth blackwell, the first female physician in the united states graduated from suny upstate (1847) medical availability and clinical practice varies across the world due to regional differences in culture and technology. modern scientific medicine is highly developed in the western world, while in developing countries such as parts of africa or asia, the population may rely more heavily on traditional medicine with limited evidence and efficacy and no required formal training for practitioners. in the developed world, evidence-based medicine is not universally used in clinical practice; for example, a 2007 survey of literature reviews found that about 49% of the interventions lacked sufficient evidence to support either benefit or harm. in modern clinical practice, physicians and physician assistants personally assess patients to diagnose, prognose, treat, and prevent disease using clinical judgment. the doctor-patient relationship typically begins an interaction with an examination of the patient's medical history and medical record, followed by a medical interview and a physical examination. basic diagnostic medical devices (e.g. stethoscope, tongue depressor) are typically used. after examination for signs and interviewing for symptoms, the doctor may order medical tests (e.g. blood tests), take a biopsy, or prescribe pharmaceutical drugs or other therapies. differential diagnosis methods help to rule out conditions based on the information provided. during the encounter, properly informing the patient of all relevant facts is an important part of the relationship and the development of trust. the medical encounter is then documented in the medical record, which is a legal document in many jurisdictions. follow-ups may be shorter but follow the same general procedure, and specialists follow a similar process. the diagnosis and treatment may take only a few minutes or a few weeks depending upon the complexity of the issue. the components of the medical interview and encounter are: chief complaint (cc): the reason for the current medical visit. these are the symptoms. they are in the patient's own words and are recorded along with the duration of each one. also called chief concern or presenting complaint. current activity: occupation, hobbies, what the patient actually does. family history (fh): listing of diseases in the family that may impact the patient. a family tree is sometimes used. history of present illness (hpi): the chronological order of events of symptoms and further clarification of each symptom. distinguishable from history of previous illness, often called past medical history (pmh). medical history comprises hpi and pmh. medications (rx): what drugs the patient takes including prescribed, over-the-counter, and home remedies, as well as alternative and herbal medicines or remedies. allergies are also recorded. past medical history (pmh/pmhx): concurrent medical problems, past hospitalizations and operations, injuries, past infectious diseases or vaccinations, history of known allergies. review of systems (ros) or systems inquiry: a set of additional questions to ask, which may be missed on hpi: a general enquiry (have you noticed any weight loss, change in sleep quality, fevers, lumps and bumps? etc.), followed by questions on the body's main organ systems (heart, lungs, digestive tract, urinary tract, etc.). social history (sh): birthplace, residences, marital history, social and economic status, habits (including diet, medications, tobacco, alcohol). the physical examination is the examination of the patient for medical signs of disease, which are objective and observable, in contrast to symptoms that are volunteered by the patient and not necessarily objectively observable. the healthcare provider uses sight, hearing, touch, and sometimes smell (e.g., in infection, uremia, diabetic ketoacidosis). four actions are the basis of physical examination: inspection, palpation (feel), percussion (tap to determine resonance characteristics), and auscultation (listen), generally in that order although auscultation occurs prior to percussion and palpation for abdominal assessments. the clinical examination involves the study of: abdomen and rectum cardiovascular (heart and blood vessels) general appearance of the patient and specific indicators of disease (nutritional status, presence of jaundice, pallor or clubbing) genitalia (and pregnancy if the patient is or could be pregnant) head, eye, ear, nose, and throat (heent) musculoskeletal (including spine and extremities) neurological (consciousness, awareness, brain, vision, cranial nerves, spinal cord and peripheral nerves) psychiatric (orientation, mental state, mood, evidence of abnormal perception or thought). respiratory (large airways and lungs) skin vital signs including height, weight, body temperature, blood pressure, pulse, respiration rate, and hemoglobin oxygen saturation it is to likely focus on areas of interest highlighted in the medical history and may not include everything listed above. the treatment plan may include ordering additional medical laboratory tests and medical imaging studies, starting therapy, referral to a specialist, or watchful observation. follow-up may be advised. depending upon the health insurance plan and the managed care system, various forms of "utilization review", such as prior authorization of tests, may place barriers on accessing expensive services. the medical decision-making (mdm) process involves analysis and synthesis of all the above data to come up with a list of possible diagnoses (the differential diagnoses), along with an idea of what needs to be done to obtain a definitive diagnosis that would explain the patient's problem. on subsequent visits, the process may be repeated in an abbreviated manner to obtain any new history, symptoms, physical findings, and lab or imaging results or specialist consultations. institutions the hospital of santa maria della scala, fresco by domenico di bartolo, 1441–1442 contemporary medicine is in general conducted within health care systems. legal, credentialing and financing frameworks are established by individual governments, augmented on occasion by international organizations, such as churches. the characteristics of any given health care system have significant impact on the way medical care is provided. from ancient times, christian emphasis on practical charity gave rise to the development of systematic nursing and hospitals and the catholic church today remains the largest non-government provider of medical services in the world. advanced industrial countries (with the exception of the united states) and many developing countries provide medical services through a system of universal health care that aims to guarantee care for all through a single-payer health care system, or compulsory private or co-operative health insurance. this is intended to ensure that the entire population has access to medical care on the basis of need rather than ability to pay. delivery may be via private medical practices or by state-owned hospitals and clinics, or by charities, most commonly by a combination of all three. most tribal societies provide no guarantee of healthcare for the population as a whole. in such societies, healthcare is available to those that can afford to pay for it or have self-insured it (either directly or as part of an employment contract) or who may be covered by care financed by the government or tribe directly. modern drug ampoules transparency of information is another factor defining a delivery system. access to information on conditions, treatments, quality, and pricing greatly affects the choice by patients/consumers and, therefore, the incentives of medical professionals. while the us healthcare system has come under fire for lack of openness, new legislation may encourage greater openness. there is a perceived tension between the need for transparency on the one hand and such issues as patient confidentiality and the possible exploitation of information for commercial gain on the other. the health professionals who provide care in medicine comprise multiple professions such as medics, nurses, physio therapists, and psychologists. these professions will have their own ethical standards, professional education, and bodies. the medical profession have been conceptualized from a sociological perspective. delivery