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- Obesity and cancerAssociation between obesity and risk of cancer
- Obesity and sexualityInfluence of obesity on sexuality
- Obesity and the environmentEnvironmental factors affecting the incidence of obesity
- Obesity hypoventilation syndromeObesity hypoventilation syndrome (OHS) is a condition in which severely overweight people
- Obesity medicineField of medicine
- Obesity paradoxMedical hypothesis
- Obesity-associated morbidityMedical condition
- Obsessive–compulsive personality disorderPersonality disorder involving orderliness
- Obstetric fistulaMedical condition
- Obstetric ultrasonographyUse of medical ultrasonography in pregnancy
- Obstetrical bleedingBleeding in pregnancy that occurs before, during, or after childbirth
- ObstetricsMedical specialty concerning pregnancy and childbirth
- Obstructive lung diseaseObstructive lung disease is a category of respiratory disease characterized by airway obst
- Obstructive shockInsufficient blood flow due to physical obstruction
- Occipital veinThe occipital vein is a vein of the scalp. It originates from a plexus around the external
- Occipitofrontalis muscleThe occipitofrontalis muscle (epicranius muscle) is a muscle which covers parts of the sku
- Occupational cancerMedical condition
- Occupational diseaseAn occupational disease or industrial disease is any chronic ailment that occurs as a resu
- Occupational lung diseaseOccupational lung diseases comprise a broad group of diseases, including occupational asth
- Occupational medicineMedical specialty concerned with the maintenance of health in the workplace
- Occupational therapyHealthcare profession
- Oculomotor apraxiaOculomotor apraxia (OMA) is the absence or defect of controlled, voluntary, and purposeful
- Oculomotor nerve palsyOculomotor nerve palsy or oculomotor neuropathy is an eye condition resulting from damage
- Office of Criminal InvestigationsThe United States Food and Drug Administration (FDA) Office of Criminal Investigations (OC
- Oil pullingAlternative medical practice
- Ola Didrik SaugstadOla Didrik Saugstad (born 5 March 1947) is a Norwegian pediatrician, neonatologist and neu
- OlanzapineAtypical antipsychotic medication
- Olanzapine/fluoxetineOlanzapine/fluoxetine (trade name Symbyax, created by Eli Lilly and Company) is a fixed-do
- OligohydramniosOligohydramnios is a medical condition in pregnancy characterized by a deficiency of amnio
- OligospermiaTerms oligospermia, oligozoospermia, and low sperm count refer to semen with a low concent
- Olmesartan/amlodipine/hydrochlorothiazideCombination drug
- Oly Ilunga KalengaOly Ilunga Kalenga (born 24 June 1960) is a Belgian–Congolese medical doctor who was the D
- OmphaloceleAn omphalocele or omphalocoele, also known as an exomphalos, is a rare abdominal wall defe
- OnchocerciasisHuman helminthiasis (infection by parasite)
- Onset of actionOnset of action is the duration of time it takes for a drug's effects to come to prominenc
- OnycholysisOnycholysis is a common medical condition characterized by the painless detachment of the
- OnychomycosisMedical condition
- OophorectomySurgical removal of the ovary or ovaries
- Open fractureMedical condition
- Operating theaterRoom in a hospital in which surgeries are performed
- Operation Warp SpeedUS program to accelerate COVID-19 vaccine efforts
- Operative vaginal deliveryOperative vaginal delivery, also known as assisted or instrumental vaginal delivery, is a
- Ophthalmic drug administrationAdministration of a drug through the eyes
- OpioidClass of analgesic drug
- Opioid antagonistReceptor antagonist that acts on one or more of the opioid receptors
- Opioid overdoseToxicity due to excessive consumption of opiates
- Opioid use disorderMedical condition
- OpisthorchiasisOpisthorchiasis is a parasitic disease caused by certain species of genus Opisthorchis (sp
- Opportunistic infectionInfection that develops from a pre-existing condition
- Opposition to water fluoridationDebate over the anti-tooth-decay measure
- Oppositional defiant disorderMental disorder involving hostility and defiance
- OPS-301German healthcare procedure classification
- Oral administrationRoute of administration where a substance is taken through the mouth
- Oral and maxillofacial surgerySurgical treatment
- Oral cancerCancer of the lining of the lips, mouth, or upper throat
- Oral contraceptive pillIndex of articles associated with the same name
- Oral medicineAn oral medicine or stomatology doctor/dentist (or stomatologist) has received additional
- Oral mucosaMouth-lining mucous membrane
- Oral polio vaccine AIDS hypothesisDisproven medical conspiracy theory
- Oral rehydration therapyType of fluid replacement used to prevent and treat dehydration
- Organ donationProcess of voluntarily giving away organs
- OrganomegalyOrganomegaly is the abnormal enlargement of organs. For example, cardiomegaly is enlargeme
- OrgonePseudoscientific concept by Wilhelm Reich
- Oropharyngeal cancerPharynx cancer that is located in the oropharynx
- OrthodonticsCorrectional branch of dentistry
- Orthomolecular medicineForm of alternative medicine
- OrthopathySystem of alternative medicine
- Orthopedic bootMedical device
- Orthopedic surgerySurgery on the musculoskeletal system
- Orthostatic hypotensionDrop in blood pressure when standing up or sitting down
- Orthostatic intoleranceDevelopment of symptoms when standing
- OrthoticsMedical specialty that focuses on the design and application of orthoses
- Orthovoltage X-raysOrthovoltage X-rays are produced by X-ray tubes operating at voltages in the 100–500 kV ra
- OseltamivirAntiviral medication used against influenza
- OsteoarthritisForm of arthritis caused by degeneration of joints
- Osteogenesis imperfectaGroup of genetic disorders resulting in fragile bones
- OsteomalaciaSoftening of bones due to impaired bone metabolism
- OsteomyologyType of alternative medicine
- OsteopathyPseudoscientific alternative medicine emphasizing muscle and bone manipulation
- OsteopeniaOsteopenia, known as "low bone mass" or "low bone density", is a condition in which bone m
- OsteoporosisSkeletal disorder
- OsteosclerosisOsteosclerosis is a disorder characterized by abnormal hardening of bone and an elevation
- Otitis externaInflammation of the ear canal
- Otitis mediaInflammation of the middle ear
- Otoacoustic emissionAn otoacoustic emission (OAE) is a sound that is generated from within the inner ear. Havi
- OtoplastySurgery to correct the deformities and defects of the auricle
- Out-of-pocket expenseAn out-of-pocket expense, or out-of-pocket cost (OOP), is the direct payment of money that
- Ovarian cancerCancer originating in or on the ovary
- Ovarian cystFluid-filled sac in the ovary
- Ovarian tumorOvarian tumors, or ovarian neoplasms, are tumors in the ovary. Not all are ovarian cancer.
- Over-the-counter drugMedication available without a prescription
- OverbiteOverbite is the extent of vertical (superior-inferior) overlap of the maxillary central in
- OverdiagnosisDiagnosis of disease that will never cause symptoms or death during a patient's lifetime
- OverweightAbove a weight considered healthy
- Oxford–AstraZeneca COVID-19 vaccineViral vector vaccine for prevention of COVID-19
- Oxidative deaminationMetabolic process
- OxycodoneOpioid medication
- Oxycodone/ibuprofenOxycodone/ibuprofen (INNs, trade name Combunox) is an oral combination drug formulation of
- Oxygen therapyUse of oxygen as a medical treatment
- Ozone therapyUnproven alternative medicine
