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Medical terms are provided by Medline
The A.D.A.M. Medical Encyclopedia includes over 4,000 articles about diseases, tests, symptoms, injuries, and surgeries.
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O'nyong-nyong fever see Dengue fever
OA see Osteoarthritis
Obesity
Obesity hypoventilation syndrome (OHS)
OBS see Organic brain syndrome
Obsessive-compulsive disorder
Obsessive-compulsive neurosis see Obsessive-compulsive disor
Obsessive-compulsive personality disorder
Obstetric sonogram see Pregnancy ultrasound
Obstetric ultrasonography see Pregnancy ultrasound
Obstructed airway see Foreign object - inhaled or swallowed
Obstruction of the ureteropelvic junction see UPJ obstructio
Obstructive sleep apnea syndrome see Sleep apnea
Obstructive uropathy
Obstructive uropathy - bilateral - acute see Acute bilateral
Obstructive uropathy - bilateral - chronic see Chronic bilat
Obstructive uropathy - unilateral - acute see Acute unilater
Obstructive uropathy - unilateral - chronic see Chronic unil
Obtundation see Consciousness - decreased
Occlusion - renal artery see Renal artery stenosis
Occlusion - renal vein see Renal vein thrombosis
Occupational asthma
Occupational bronchitis see Industrial bronchitis
Occupational hearing loss
OCD see Obsessive-compulsive disorder
OCG see Oral cholecystogram
Ocular larva migrans see Visceral larva migrans
Ocular melanoma see Melanoma of the eye
Ocular motility examination see Extraocular muscle function
Oculoglandular syndrome see Parinaud syndrome
Odynophagia see Painful swallowing
Off-pump coronary artery bypass see Minimally invasive heart
OG - infants see Feeding tube - infants
Ogilvie's syndrome see Primary intestinal pseudo-obstruction
Ohara disease see Tularemia
Ohio River Valley fever see Histoplasmosis
OHSS see Ovarian hyperstimulation syndrome
Oil of wintergreen overdose see Methyl salicylate overdose
Oil see Diesel oil
Oil-based paint poisoning
Oily hair
Oily skin
Oleander
Oligodendroglioma - children see Brain tumor - children
Oliguria see Urine output - decreased
Olivopontocerebellar atrophy
Olivopontocerebellar degeneration see Olivopontocerebellar a
OME see Otitis media with effusion
Omphalocele
Omphalocele repair
Ondine's curse see Primary alveolar hypoventilation
Onychocryptosis see Ingrown toenail
Onycholysis see Nail abnormalities
Onychomycosis see Fungal nail infection
Oophoritis see Pelvic inflammatory disease (PID)
OPCA see Olivopontocerebellar atrophy
OPCAB see Minimally invasive heart surgery
Open bite see Malocclusion of teeth
Open browlift see Forehead lift
Open cholecystectomy see Gallbladder removal
Open heart surgery
Open injury bleeding see Bleeding
Open lung biopsy
Open pleural biopsy
Open prostatectomy see Prostate removal
Open thyroid biopsy see Thyroid excisional biopsy
Open wound see Cuts and puncture wounds
Open-angle glaucoma see Glaucoma
Ophthalmalgia see Eye pain
Ophthalmia neonatorum see Neonatal conjunctivitis
Ophthalmoscopy
Opiate withdrawal
Opioid intoxication
Opisthotonos
Oppositional defiant disorder
Optic glioma
Optic nerve atrophy
Optic neuritis
Oral cancer
Oral cholecystogram
Oral glucose tolerance test see Glucose tolerance test
Oral hypoglycemics overdose
Oral thrush see Thrush
Oral ulcer see Mouth ulcers
Orange crush overdose see Dextromethorphan overdose
Orbit CT scan
Orbital cellulitis
Orbital pseudotumor
Orbital-craniofacial surgery see Head and face reconstructio
Orchidopexy see Undescended testicle repair
Orchiopexy see Undescended testicle repair
Orchitis
Organic brain syndrome
Organic mental disorder (OMS) see Organic brain syndrome
Orgasmic dysfunction
Orientation see Mental status tests
Ormond's disease see Retroperitoneal fibrosis
Ornamental pepper poisoning see Jerusalem cherry poisoning
Ornithosis see Psittacosis
Orofacial apraxia see Apraxia
Oropharynx lesion biopsy
Orthopnea see Breathing difficulty - lying down
Orudis overdose see Ketoprofen overdose
Osgood-Schlatter disease
Osler's disease see Polycythemia vera
Osler-Weber-Rendu syndrome
Osmolality - blood
Osmolality - urine
Osmotic diuresis
Osmotic fragility
Osteitis deformans see Paget’s disease
Osteitis fibrosa
Osteitis fibrosa cystica see Osteitis fibrosa
Osteoarthritis
Osteoarthrosis see Osteoarthritis
Osteochondrosis see Osgood-Schlatter disease
Osteogenesis imperfecta
Osteogenic sarcoma see Osteosarcoma
Osteomalacia
Osteomalacia in children see Rickets
Osteomas see Benign ear cyst or tumor
Osteomyelitis
Osteomyelitis of the skull see Malignant otitis externa
Osteopathic physician see Doctor of Osteopathy (D.O.)
Osteopenia - premature infants
Osteoporosis
Osteoporosis and aging see Aging changes in the bones - musc
Osteosarcoma
Ostomy - resources
Otalgia see Earache
Otitis
Otitis externa - acute see Swimmer's ear
Otitis externa - chronic see Swimmer's ear - chronic
Otitis externa - malignant see Malignant otitis externa
Otitis media - acute see Ear infection - acute
Otitis media - chronic
Otitis media with effusion
Otoplasty see Cosmetic ear surgery
Otorrhea see Ear discharge
Otosclerosis
Otospongiosis see Otosclerosis
Ovarian cancer
Ovarian cancer dangers
Ovarian cysts
Ovarian growths
Ovarian hyperstimulation syndrome
Ovarian hypofunction
Ovarian overproduction of androgens
Oven cleaners
Over-the-counter birth control
Overactive bladder see Urge incontinence
Overactive thyroid see Hyperthyroidism
Overbite see Malocclusion of teeth
Overbreathing see Hyperventilation
Overcoming breastfeeding problems
Overdose
Overdose - hydrocodone see Hydrocodone/oxycodone overdose
Overdose - oxycodone see Hydrocodone/oxycodone overdose
Overdose from drugs see Drug abuse first aid
Overeating - resources see Eating disorders - resources
Overgrowth - intestinal bacteria see Small bowel bacterial o
Overweight
Ovulation pain see Mittelschmerz
Ovulation prediction test see LH urine test (home test)
Owren's disease see Factor V deficiency
Oxalic acid
Oxazepam overdose
Oxpam overdose see Oxazepam overdose
OxyContin overdose see Hydrocodone/oxycodone overdose
Oxygen therapy - infants
Oxyuriasis see Pinworms
Oxyuriasis test see Pinworm test
Ozena