| Topics![[expand]](./images/m/index_expand.gif) Obesity![[file]](images/m/file.gif) Obesity-hypoventilation syndrome  - Obsession
- Obsessive-compulsive disorder
- Obsessive-compulsive personality disorder
- Obstructive airway disorders
- Obstructive shock
- Obturator sign
- Occipital bone, abnormalities of
- Occipital lobe
- Occlusive thromboaortopathy
- Occupation
- Occupational therapy
- Ockelbo disease
- Octamethyl pyrophosphoramide poisoning
- Octopus bite
- Octreotide
- Ocular, (see also Eye(s); Optic nerve; Vision)
- Ocular cicatricial pemphigoid
- Ocular larva migrans
- Ocular migraine
- Ocular motility
- Oculoauriculovertebral dysplasia
- Oculocephalic reflex
- Oculocutaneous albinism
- Oculoglandular listeriosis
- Oculoglandular syndrome, Parinaud's
- Oculogyric crisis, antipsychotic-induced
- Oculomotor nerve (3rd cranial nerve)
- Oculovestibular (caloric) testing
- Odds ratio
- Odontoid process, hypoplasia of
- Odontoma
- Ofloxacin
- Ogilvie's syndrome
- Oil of wintergreen poisoning
- Ointments
- OKT3
- Olanzapine
- Older Americans Act
- Oleander poisoning
- Olecranon bursa
- Olfactory nerve (1st cranial nerve)
- Oligella infection
- Oligodendroglioma
- Oligohydramnios
- Oligomenorrhea
- Oligosaccharidoses
- Oligospermia
- Oliguria
- Olivopontocerebellar atrophy
- Olmesartan
- Olsalazine
- Omalizumab
- Omega-3 acid ethyl esters
- Omega-3 fatty acids
- Omenn's syndrome
- Omeprazole
- Omphalocele
- Omsk hemorrhagic fever
- Onchocerciasis
- Oncocytoma
- Oncogenes
- Ondansetron
- Ondine's curse
- One-and-a-half syndrome
- Onychocryptosis
- Onychogryphosis
- Onycholysis
- Onychomycosis
- Onycho-osteodysplasia
- Onychophagia
- Onychotillomania
- Oocytes
- Oophoritis, mumps
- Ophiasis
- Ophidiophobia
- Ophthalmia neonatorum
- Ophthalmic disorders (see Eye(s); Ocular; Optic nerve; Vision)
- Ophthalmic herpes zoster
- Ophthalmitis, listerial
- Ophthalmopathy
- Ophthalmoplegia
- Ophthalmoscopy
- Opiates (see Morphine; Opioids)
- Opioids
- Opisthorchiasis
- Opisthorchis sinensis infection
- Opium
- Opium tincture
- Oppenheim reflex
- Oppositional defiant disorder
- Opsoclonus
- Opsonins
- Optic glioma
- Optic nerve (2nd cranial nerve)
- Optic neuromyelitis
- Oral cavity (see Mouth)
- Oral contraceptives
- Oral-facial-digital syndrome
- Oral rehydration therapy
- Orbit
- Orbivirus infection
- Orchiectomy
- Orchiopexy
- Orchitis
- Orexin
- Orf virus infection
- Organ donation
- Organic acids, metabolic defects of
- Organic brain disorders (see Delirium; Dementia)
- Organic dust toxic syndrome
- Organomegaly, in inborn errors of metabolism
- Organophosphate poisoning
- Orgasm
- Oriental cholangiohepatitis
- Oriental liver fluke infection
- Oriental lung fluke infection
- Oriental sore
- Orlistat
- Ornish diet
- Ornithinemia
- Ornithine transcarbamoylase deficiency
- Ornithine-transcarbamoylase deficiency
- Oropharyngeal airway
- Orotic aciduria
- Oroya fever
- Orphenadrine
- Orthodromic reciprocating tachycardia
- Orthomolecular therapy
- Orthopnea, heart failure and
- Orthoses
- Orthostatic hypotension
- Orthotopic neobladder
- Ortner's syndrome
- Ortolani maneuver
- Oseltamivir
- Osgood-Schlatter disease
- Osler's nodes
- Osmolality
- Osmolar gap
- Osmolarity
- Osmotic demyelination syndrome
- Osmotic fragility test
- Osmotic gap, stool
- Os odontoideum
- Ossification, heterotopic (myositis ossificans)
- Osteitis, syphilitic
- Osteitis deformans
- Osteitis fibrosa
- Osteitis fibrosa cystica
- Osteoarthritis (degenerative joint disease)
- Osteoarthropathy
- Osteoblasts
- Osteocalcin
- Osteochondrodysplasias
- Osteochondroma (osteocartilaginous exostoses)
- Osteochondromatosis, synovial
- Osteochondroses
- Osteoclasts
- Osteodystrophy
- Osteogenesis imperfecta
- Osteoma
- Osteomalacia
- Osteomyelitis
- Osteonecrosis
- Osteo-onychodysplasia
- Osteopenia
- Osteopetroses
- Osteopoikilosis
- Osteoporosis
- Osteoradionecrosis
- Osteosarcoma (osteogenic sarcoma)
- Osteosclerosis
- Osteotomy
- Ostium secundum defect
- Otalgia
- Otitis externa
- Otitis media
- Otoacoustic emission testing
- Otolith
- Otomycosis
- Otorrhea
- Otosclerosis
- Ouchterlony double diffusion test
- Ovalocytes
- Ovarian hyperstimulation, controlled
- Ovarian hyperstimulation syndrome
- Ovary(ies)
- Overflow incontinence
- Overnutrition
- Overuse injury
- Ovulation
- Oxacillin
- Oxalates
- Oxalic acid poisoning
- Oxaliplatin
- Oxaluria
- Oxamniquine
- Oxamyl poisoning
- Oxaprozin
- Oxazepam
- Oxazolidinones
- Oxcarbazepine
- Oxicams
- Oxiconazole
- Oxidative phosphorylation disorders
- Oximetry
- 5-Oxoprolinase deficiency
- Oxybutynin
- Oxycodone
- Oxydemeton-methyl poisoning
- Oxygen
- Oxygenation
- Oxygenation index
- Oxygen therapy
- Oxyhemoglobin dissociation curve
- Oxymetazoline
- Oxymetholone
- Oxymorphone
- Oxytocin
- Oxytocin challenge test
- Oxyuriasis
- Ozone
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