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Health encyclopedia articles[edit source]
- O. H. Frazier
- O6-Benzylguanine
- OHVIRA
- OPQRST
- ORG-2058
- OSCAR McMaster
- OSLAM syndrome
- OSU-6162
- Oakland Fire Department
- Oat sensitivity
- Oath of Maimonides
- Obdormition
- Ober's test
- Obesity
- Obesity and fertility
- Obesity and the environment
- Obesity hypoventilation syndrome
- Obesity in China
- Obesity paradox
- Obesity-associated morbidity
- Obesogen
- Obetrol
- Obiltoxaximab
- Objective structured clinical examination
- Obligatory Dangerousness Criterion
- Oblique cord
- Obliterating endarteritis
- Obsessive love
- Obsessive-Compulsive Disorder
- Obsessive–compulsive disorder
- Obsessive–compulsive personality disorder
- Obsessive–compulsive spectrum
- Obstetric fistula
- Obstetric ultrasonography
- Obstetrical bleeding
- Obstetrical forceps
- Obstetrics
- Obstetrics and gynaecology
- Obstructed defecation
- Obstructed labour
- Obstructive lung disease
- Obstructive purpura
- Obstructive shock
- Obstructive sleep apnea
- Obtundation
- Obturator hernia
- Obturator sign
- Occipital cryoneurolysis
- Occipital epilepsy
- Occipital horn syndrome
- Occipital nerve block
- Occipital nerve stimulation
- Occipital neuralgia
- Occipital triangle
- Occlusive dressing
- Occult macular dystrophy
- Occupational Health
- Occupational Medicine (Hanley & Belfus journal)
- Occupational Medicine (Oxford University Press journal)
- Occupational Therapy
- Occupational acne
- Occupational and Environmental Medicine
- Occupational asthma
- Occupational disease
- Occupational exposure to Lyme disease
- Occupational health
- Occupational hygiene
- Occupational injury
- Occupational lung disease
- Occupational medicine
- Occupational noise
- Occupational safety and health
- Occupational therapist
- Occupational therapy
- Occupational therapy and substance use disorder
- Ochroconis gallopava
- Ochronosis
- Ochsner Health System
- Ocrelizumab
- Octopamine
- Octreotide
- Octreotide scan
- Ocular albinism
- Ocular albinism type 1
- Ocular dysmetria
- Ocular flutter
- Ocular hypertension
- Ocular immune system
- Ocular ischemic syndrome
- Ocular larva migrans
- Ocular melanosis
- Ocular myasthenia
- Ocular neurosis
- Ocular prosthesis
- Ocular rosacea
- Ocular tilt reaction
- Ocular tonometry
- Ocular tremor
- Oculo-respiratory syndrome
- Oculocardiac reflex
- Oculocerebrocutaneous syndrome
- Oculocerebrorenal syndrome
- Oculocutaneous albinism
- Oculocutaneous albinism type I
- Oculodentodigital dysplasia
- Oculogyric crisis
- Oculomotor nerve
- Oculomotor nerve palsy
- Oculomucocutaneous syndrome
- Oculopharyngeal muscular dystrophy
- Oculoplastics
- Odalasvir
- Odds ratio
- Odette Abadi
- Odette Ferreira
- Odilon Lannelongue
- Odom's indicator
- Odontogenic infection
- Odontogenic keratocyst
- Odontogenic tumor
- Odontoma dysphagia syndrome
- Odonto–tricho–ungual–digital–palmar syndrome
- Odynophagia
- Ofatumumab
- Ofelia Olivero
- Office of AIDS Research
- Office of Biorepositories and Biospecimen Research
- Office of Cancer Complementary and Alternative Medicine
- Official Medicines Control Laboratory
- Ofloxacin
- Ogilvie syndrome
- Ogino Ginko
- Oguchi disease
- Oheneba Boachie-Adjei
- Ohio Youth Problems, Functioning and Satisfaction Scales (Ohio scales)
- Ohngren's line
- Ohtahara syndrome
- Oil acne
- Oil pulling
- Ointment
- Okamoto syndrome
- Okinawa Centenarian Study
- Oklahoma Medical Research Foundation
- Oklahoma State University Center for Health Sciences
- Olaf B. Paulson
- Olanzapine
- Olanzapine/fluoxetine
- Olaparib
- Olaratumab
- Olav Torgersen
- Olcay Neyzi
- Old person smell
- Oleandrin
- Olecranon bursitis
- Olestra
- Oleuropein
- Olfactophilia
- Olfactory fatigue
- Olfactory nerve
- Olfactory reference syndrome
- Olfactory tract
- Olfactory trigone
- Oliceridine
- Oliger Jacobaeus
- Oligoarthritis
- Oligoastrocytoma
- Oligoclonal band
- Oligodactyly
- Oligodendroglioma
- Oligohydramnios
- Oligomenorrhea
- Oligospermia
- Oliguria
- Olive Kobusingye
- Oliver H. Lowry
- Oliver Sacks
- Oliver Wendell Holmes Sr.
- Oliver's sign
- Oliver–McFarlane syndrome
- Olivopontocerebellar atrophy
- Ollier disease
- Olmesartan
- Olmesartan/amlodipine
- Olney's lesions
- Olopatadine
- Olsalazine
- Olufunmilayo Olopade
- Omalizumab
- Omar Fakhri
- Omega-3 Fatty Acids
- Omega-3 acid ethyl esters
- Omega-3 carboxylic acids
- Omega-3 fatty acid
- Omega-6 fatty acid
- Omenn syndrome
- Omental cake
- Omental infarction
- Omentopexy
- Omeprazole
- Omphalitis of newborn
- Omphalocele
- Omphalomesenteric duct cyst
- Omsk hemorrhagic fever
- On Ancient Medicine
- On-call room
- Onchocerca volvulus
- Onchocerciasis
- Onchocercidae
- Oncocytoma
- Oncogene
- Oncogene (journal)
- Oncogenic retroviridae protein
- Oncogenomics
- Oncology
- Oncology Care Model
- Oncology Reports
- Oncology nursing
- Oncolytic adenovirus
- Oncolytic virus
- Oncophage
- Oncotherm
- Oncovirus
- Ondansetron
- One Campaign
- One Health
- One and a half syndrome
- OneTouch Ultra
- Oneiroid syndrome
- Oneirophrenia
- Onesimus (Bostonian)
- Oni Akerele
- Oni Emmanuel Idigbe
- Online Mendelian Inheritance in Man
- Online health communities
- Online pharmacy laws in India
- Onselling of sperm
- Ontario Cancer Institute
- Ontario College of Family Physicians
- Ontario Health Insurance Plan
- Ontario Medical Association
- Ontario Minamata disease
- Onychauxis
- Onychoatrophy
- Onychogryphosis
- Onycholysis
- Onychomadesis
- Onychomatricoma
- Onychomycosis
- Onychophosis
- Onychoptosis defluvium
- Onychorrhexis
- Onychoschizia
- Onychotillomania
- Oocyte cryopreservation
- Oocyte selection
- Oophorectomy
- Oophoritis
- Open Medicine (De Gruyter journal)
- Open Medicine (John Willinsky journal)
- Open Prosthetics Project
- Open aortic surgery
- Open biopsy
- Open defecation
- Open fracture
- Open-label trial
- OpenEMR
- OpenNeuro
- Operating microscope
- Operating room management
- Operating table
- Operating theater
- Operation Coffee Cup
- Operation Continuing Promise
- Operation Safety Net
- Operation Warp Speed
- Operation of computed tomography
- Operational Research CONsultancy
- Operative report
- Ophanin
- Ophelia Project
- Ophiasis
- Ophthalmia
- Ophthalmia nodosa
- Ophthalmic artery
- Ophthalmic drug administration
- Ophthalmic medical practitioner
- Ophthalmic pathology
- Ophthalmology
- Ophthalmology in medieval Islam
- Ophthalmoparesis
- Ophthalmoscope
- Ophthalmoscopy
- Opiates
- Opioid
- Opioid antagonist
- Opioid epidemic
- Opioid epidemic in the United States
- Opioid modulator
- Opioid overdose
- Opioid peptide
- Opioid use disorder
- Opioid-induced hyperalgesia
- Opipramol
- Opisthorchis felineus
- Opisthorchis viverrini
- Opisthotonus
- Opitz G/BBB syndrome
- Oppenheim's sign
- Opportunistic infection
- Oppositional defiant disorder
- Opsoclonus
- Opsoclonus myoclonus syndrome
- Optic atrophy
- Optic cup (embryology)
- Optic disc drusen
- Optic disc pallor
- Optic nerve glioma
- Optic nerve hypoplasia
- Optic nerve sheath meningioma
- Optic neuritis
- Optic neuropathy
- Optic papillitis
- Optic recess
- Optic stalk
- Optic vesicle
- Optical Express
- Optical aberration
- Optical coherence tomography
- Optician
- Optimal cutting temperature compound
- Optimax
- Optoelectronic plethysmography
- Optokinetic drum
- Optokinetic response
- Optometric Extension Program
- Optometry
- Optomyography
- Ora serrata
- OraQuick
- Oragen
- Oral Cancer
- Oral administration
- Oral allergy syndrome
- Oral and maxillofacial pathology
- Oral and maxillofacial surgery
- Oral cancer
- Oral candidiasis
- Oral florid papillomatosis
- Oral food challenge
- Oral hygiene
- Oral manifestations of systemic disease
- Oral microbiology
- Oral mucocele
- Oral pigmentation
- Oral polio vaccine AIDS hypothesis
- Oral rehydration therapy
- Oral submucous fibrosis
- Orange City Fire Department
- Orange County Fire Authority
- Orbis International
- Orbital apex syndrome
- Orbital blowout fracture
- Orbital cellulitis
- Orbital septum
- Orbital x-ray
- Orchid (charity)
- Orchidometer
- Orchiectomy
- Orchiopexy
- Orchitis
- Order of Malta Ambulance Corps
- Orderly
- Oregon Health & Science University
- Oregon Medicaid health experiment
- Orellanine
- Orexin
- Orf (disease)
- Organ Transplantation
- Organ care system
- Organ donation
- Organ donation after medical assistance in dying
- Organ donation in India
- Organ dysfunction
- Organ gifting
- Organ harvesting from Falun Gong practitioners in China
- Organ perforation
- Organ printing
- Organ procurement
- Organ trade
- Organ transplantation
- Organ transplantation in China
- Organ transplantation in Israel
- Organ transplantation in Japan
- Organ transplantation in Tamil Nadu
- Organ xenotransplantation
- Organ-limited amyloidosis
- Organic acidemia
- Organic brain syndrome
- Organization for Understanding Cluster Headaches
- Organomegaly
- Organophosphate
- Organophosphate poisoning
- Organophosphate-induced delayed neuropathy
- Orgasmalgia
- Orgasmic platform
- Orgastic potency
- Orientation and Mobility
- Origin recognition complex
- Original antigenic sin
- Orishejolomi Thomas
- Oritavancin
- Orlando Health
- Orlistat
- Ormeloxifene
- Ornithinaemia
- Ornithine transcarbamylase deficiency
- Ornithine translocase deficiency
- Orofacial granulomatosis
- Orofacial myofunctional disorders
- Orofacial pain
- Orofaciodigital syndrome
- Orofaciodigital syndrome 1
- Oromandibular dystonia
- Oropharyngeal airway
- Oropharyngeal cancer
- Oropharyngeal dysphagia
- Oropouche fever
- Orotic aciduria
- Orphan Drug Act of 1983
- Orphan disease
- Orphan patient
- Orphanet
- Orphenadrine
- Ortek Therapeutics
- Ortho Clinical Diagnostics
- Orthodontia
- Orthodromic
- Orthognathic surgery
- Orthogonal polarization spectral imaging
- Orthohantavirus
- Orthokeratology
- Orthokeratosis
- Orthomolecular medicine
- Orthomolecular psychiatry
- Orthopaedic physician's assistant
- Orthopaedic sports medicine
- Orthopaedic templating
- Orthopedic cast
- Orthopedic pathology
- Orthopedic plate
- Orthopedic surgery
- Orthopnea
- Orthoptics
- Orthorexia nervosa
- Orthosilicic acid
- Orthostatic albuminuria
- Orthostatic headache
- Orthostatic hypertension
- Orthostatic hypotension
- Orthostatic intolerance
- Orthostatic purpura
- Orthovoltage X-rays
- Ortner's syndrome
- Ortolani test
- Osborn v. Irwin Memorial Blood Bank
- Oscar Liebreich
- Oscillopsia
- Oseltamivir
- Osgood–Schlatter disease
- Oskar Fehr
- Oskar Kohnstamm
- Oskar Lassar
- Oskar Simon
- Osler Library of the History of Medicine
- Osler's node
- Osmol gap
- Osmophobia
- Osmostat
- Osmotherapy
- Osmotic dilator
- Ospemifene
- Osseoincorporation
- Osseointegration
- Ossification
- Ossification center
- Ossification of humerus
- Ossifying fibromyxoid tumour
- Ostectomy
- Osteitis fibrosa cystica
- Osteitis pubis
- Osteo-odonto-keratoprosthesis
- Osteoarthritis
- Osteoarthritis Research Society International
- Osteoblastoma
- Osteochondritis
- Osteochondritis dissecans
- Osteochondrodysplasia
- Osteochondroma
- Osteochondromatosis
- Osteochondropathy
- Osteochondroprogenitor cell
- Osteochondrosis
- Osteoclast
- Osteodystrophy
- Osteogenesis Imperfecta
- Osteogenesis imperfecta
- Osteoid
- Osteoid osteoma
- Osteoimmunology
- Osteolysis
- Osteoma
- Osteoma cutis
- Osteomalacia
- Osteometric points
- Osteomyelitis
- Osteon
- Osteonecrosis
- Osteonecrosis of the jaw
- Osteopathia striata
- Osteopathic Physicians & Surgeons v. California Medical Ass'n
- Osteopathic manipulation
- Osteopathic medicine in Canada
- Osteopathic medicine in the United States
- Osteopaths Act 1993
- Osteopathy Board of Australia
- Osteopenia
- Osteopetrosis
- Osteophyte
- Osteoplasty
- Osteopoikilosis
- Osteoporosis
- Osteoporosis circumscripta
- Osteosarcoma
- Osteosclerosis
- Osteostimulation
- Osteosynthesis
- Osteotome
- Osteotomy
- Ostial disease
- Ostium primum atrial septal defect
- Ostomy
- Ostomy system
- Oswald Berkhan
- Oswald Kohts
- Oswald Schmiedeberg
- Oswald Taylor Brown
- Oswaldo Cruz Foundation
- Other specified feeding or eating disorder
- Otic pit
- Otic polyp
- Otic vesicle
- Otis Boykin
- Otitis
- Otitis Media
- Otitis externa
- Otitis media
- Otoacoustic emission
- Otocephaly
- Otofacial syndrome
- Otology
- Otomycosis
- Otophyma
- Otoplasty
- Otorhinolaryngology
- Otosclerosis
- Otoscope
- Otospondylomegaepiphyseal dysplasia
- Ototoxicity
- Ottawa Paramedic Service
- Ottawa ankle rules
- Ottawa knee rules
- Otto F. Kernberg
- Otto Fritz Meyerhof
- Otto Haab
- Otto Heinrich Enoch Becker
- Otto Heurnius
- Otto Lowenstein
- Otto Lubarsch
- Otto Marburg
- Otto Schirmer
- Otto Schultzen
- Otto Wilhelm Madelung
- Otto von Schrön
- Ottomar Rosenbach
- Our Stolen Future
- Ouse to Ouse Tock
- Out-of-body experience
- Outbreak response
- Outcomes Research Consortium
- Outcomes paradox
- Outdoor emergency care
- Outer nuclear layer
- Outer plexiform layer
- Outpatient commitment
- Outpatient department
- Outpatient surgery
- Ovandrotone
- Ovarian Cancer
- Ovarian Cysts
- Ovarian apoplexy
- Ovarian cancer
- Ovarian cyst
- Ovarian drilling
- Ovarian follicle atresia
- Ovarian germ cell tumors
- Ovarian hyperstimulation syndrome
- Ovarian mucinous tumor
- Ovarian pregnancy
- Ovarian remnant syndrome
- Ovarian reserve
- Ovarian serous cystadenoma
- Ovarian torsion
- Ovarian vein syndrome
- Ovariectomized rat
- Over-the-counter drug
- Overactive bladder
- Overactive disorder associated with mental retardation and stereotyped movements
- Overbite
- Overdiagnosis
- Overeaters Anonymous
- Overeating
- Overgrowth syndrome
- Overlap syndrome
- Overmedication
- Overnutrition
- Overriding aorta
- Overscreening
- Overseas trained doctors in Australia
- Overuse syndrome
- Overweight
- Overwhelming post-splenectomy infection
- Ovid Technologies
- Ovulation induction
- Ovulatory shift hypothesis
- Owen Harding Wangensteen
- Owen Wade (physician)
- Owens & Minor
- Owl's eye appearance
- Oxabolone cipionate
- Oxaliplatin
- Oxamniquine
- Oxandrolone
- Oxaprozin
- Oxazepam
- Oxcarbazepine
- Oxford Health Alliance
- Oxford Ophthalmological Congress
- Oxford knee score
- Oxford–AstraZeneca COVID-19 vaccine
- Oxinium
- Oxogestone
- Oxprenolol
- Oxybuprocaine
- Oxybutynin
- Oxycephaly
- Oxycholesterol
- Oxycodone
- Oxycodone/aspirin
- Oxycodone/ibuprofen
- Oxycodone/naloxone
- Oxygen concentrator
- Oxygen enhancement ratio
- Oxygen equivalent
- Oxygen mask
- Oxygen pulse
- Oxygen saturation
- Oxygen saturation (medicine)
- Oxygen tent
- Oxygen therapy
- Oxygen toxicity
- Oxygenation index
- Oxymetazoline
- Oxymetholone
- Oxyphil cell (pathology)
- Oxytetracycline
- Oxytocin (medication)
- Oye Gureje
- Ozenoxacin
- Ozone
- Ozone therapy
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Contributors: Prab R. Tumpati, MD
