Encyclopedia Home >Diseases & Conditions (A-Z)
O'nyong-nyong feverOral ulcer
OAOrbital cellulitis
ObesityOrbital pseudotumor
Obesity hypoventilation syndrome (OHS)Orchitis
OBSOrganic brain syndrome
Obsessive-compulsive disorderOrganic mental disorder (OMS)
Obsessive-compulsive neurosisOrmond's disease
Obsessive-compulsive personality disorderOrnithosis
Obstruction of the ureteropelvic junctionOrthostatic hypotension
Obstructive sleep apnea syndromeOsgood-Schlatter disease
Obstructive uropathyOsler's disease
Obstructive uropathy - bilateral - acuteOsler-Weber-Rendu syndrome
Obstructive uropathy - bilateral - chronicOsmotic diuresis
Obstructive uropathy - unilateral - acuteOsteitis deformans
Obstructive uropathy - unilateral - chronicOsteitis fibrosa
Occlusion - renal arteryOsteitis fibrosa cystica
Occlusion - renal veinOsteoarthritis
Occupational asthmaOsteoarthrosis
Occupational bronchitisOsteochondrosis
Occupational hearing lossOsteogenesis imperfecta
OCDOsteogenic sarcoma
Ocular albinismOsteomalacia
Ocular larva migransOsteomalacia in children
Ocular melanomaOsteomas
Oculocutaneous albinismOsteomyelitis
Oculoglandular syndromeOsteomyelitis of the skull
Oculomotor palsyOsteonecrosis
Ogilvie's syndromeOsteopenia - premature infants
Ohara diseaseOsteoporosis
Ohio River Valley feverOsteosarcoma
OHSSOtitis
Oligodendroglioma - adultsOtitis externa - acute
Oligodendroglioma - childrenOtitis externa - chronic
Olivopontocerebellar atrophyOtitis externa - malignant
Olivopontocerebellar degenerationOtitis media - acute
OMEOtitis media - chronic
OmphaloceleOtitis media with effusion
Ondine's curseOtosclerosis
OnychocryptosisOtospongiosis
OnychomycosisOvalocytosis - hereditary
OophoritisOvarian cancer
OPCAOvarian cysts
Open angle glaucomaOvarian hyperstimulation syndrome
Open biteOvarian hypofunction
Ophthalmia neonatorumOvarian overproduction of androgens
Opiate withdrawalOveractive bladder
Opioid intoxicationOveractive thyroid
Oppositional defiant disorderOverbite
Optic gliomaOvergrowth - intestinal bacteria
Optic nerve atrophyOvulation pain
Optic nerve gliomaOwren's disease
Optic neuritisOxyuriasis
Oral cancerOzena
Oral thrush 
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