List of diseases (O)

This is a list of diseases starting with the letter "O".

O–Ob

 * O Doherty syndrome
 * O Donnell Pappas syndrome
 * Obesophobia
 * Obsessive–compulsive disorder (OCD)
 * Obsessive–compulsive personality disorder
 * Obstructive asymmetric septal hypertrophy
 * Obstructive sleep apnea

Occ–Och

 * Occipital horn syndrome
 * Occlusive infantile arteriopathy
 * Occult spinal dysraphism
 * Occupational asthma
 * Occupational asthma - animals, insects and fungi
 * Occupational asthma - chemicals and materials
 * Occupational asthma - drugs and enzymes
 * Occupational asthma - grains, flours, plants and gums
 * Occupational asthma - isocyanates and metals
 * Occupational asthma - wood
 * OCD
 * Ochoa syndrome
 * Ochronosis, hereditary
 * Ochronosis
 * Ockelbo disease

Ocula

 * Ocular albinism
 * Ocular coloboma-imperforate anus
 * Ocular convergence spasm
 * Ocular histoplasmosis
 * Ocular melanoma
 * Ocular motility disorders
 * Ocular toxoplasmosis

Oculo

 * Oculo-auriculo-vertebral spectrum
 * Oculo cerebral dysplasia
 * Oculo cerebro acral syndrome
 * Oculo cerebro osseous syndrome
 * Oculo dento digital dysplasia
 * Oculo digital syndrome
 * Oculo facio cardio dental syndrome
 * Oculo skeletal renal syndrome
 * Oculo tricho anal syndrome
 * Oculo tricho dysplasia

Oculoa–Oculog

 * Oculoauriculofrontonasal syndrome
 * Oculo-auriculo-vertebral dysplasia
 * Oculocerebral hypopigmentation syndrome Cross type
 * Oculocerebral hypopigmentation syndrome type Preus
 * Oculocerebral syndrome with hypopigmentation
 * Oculocerebrocutaneous syndrome
 * Oculocerebrorenal syndrome
 * Oculocutaneous albinism immunodeficiency
 * Oculocutaneous albinism type 1
 * Oculocutaneous albinism type 2
 * Oculocutaneous albinism type 3
 * Oculocutaneous albinism, tyrosinase negative
 * Oculocutaneous albinism, tyrosinase positive
 * Oculocutaneous tyrosinemia
 * Oculodental syndrome Rutherfurd syndrome
 * Oculodentodigital dysplasia dominant
 * Oculodentodigital syndrome
 * Oculo-dento-digital syndrome
 * Oculodentoosseous dysplasia dominant
 * Oculodentoosseous dysplasia recessive
 * Oculodigitoesophagoduodenal syndrome
 * Oculo-gastrointestinal muscular dystrophy

Oculom–Oculor

 * Oculomaxillofacial dysostosis
 * Oculomaxillofacial dysplasia with oblique facial clefts
 * Oculomelic amyoplasia
 * Oculomotor nerve palsy
 * Oculopalatoskeletal syndrome
 * Oculopharyngeal muscular dystrophy
 * Oculorenocerebellar syndrome

Od–Ok

 * Odonto onycho dysplasia with alopecia
 * Odontoma
 * Odontomicronychial dysplasia
 * Odontoonychodermal dysplasia
 * Odontophobia
 * Odontotrichomelic hypohidrotic dysplasia
 * OFD syndrome type 8
 * OFD syndrome type Figuera
 * Ogilvie's syndrome
 * Ohaha syndrome
 * Ohdo–Madokoro–Sonoda syndrome
 * Oikophobia
 * Okamuto–Satomura syndrome

Ol

 * Olfactophobia
 * Oligodactyly
 * Oligodactyly tetramelia postaxial
 * Oligomeganephronic renal hypoplasia
 * Oligomeganephrony
 * Oligophernia
 * Oliver–McFarlane syndrome
 * Oliver syndrome
 * Olivopontocerebellar atrophy deafness
 * Olivopontocerebellar atrophy type 1
 * Olivopontocerebellar atrophy type 2
 * Olivopontocerebellar atrophy type 3
 * Olivopontocerebellar atrophy
 * Ollier disease
 * Olmsted syndrome
 * Olney's lesions

Om–On

 * Omenn syndrome
 * Omodysplasia type 1
 * Omodysplasia type 2
 * Omphalocele cleft palate syndrome lethal
 * Omphalocele exstrophy imperforate anus
 * Omphalomesenteric cyst
 * Omsk hemorrhagic fever
 * Onat syndrome
 * Onchocerciasis
 * Oncocytoma
 * Ondine's curse
 * Oneirophobia
 * Onychocryptosis
 * Onychogryphosis
 * Onycholysis
 * Onychomadesis
 * Onychomatricoma
 * Onychomycosis
 * Onychonychia hypoplastic distal phalanges
 * Onychophosis
 * Onychotrichodysplasia and neutropenia

Opi-Ops

 * Opioid dependence
 * Opioid-induced hyperalgesia
 * Ophthalmic icthyosis
 * Ophthalmo acromelic syndrome
 * Ophthalmomandibulomelic dysplasia
 * Ophthalmophobia
 * Ophthalmoplegia ataxia hypoacusis
 * Ophthalmoplegia mental retardation lingua scrotalis
 * Ophthalmoplegia myalgia tubular aggregates
 * Ophthalmoplegia progressive external scoliosis
 * Opitz–Mollica–Sorge syndrome
 * Opitz–Reynolds–Fitzgerald syndrome
 * Opitz syndrome
 * Opportunistic infections
 * Oppositional defiant disorder
 * Opsismodysplasia

Opt

 * Optic atrophy ophthalmoplegia ptosis deafness myopia
 * Optic atrophy polyneuropathy deafness
 * Optic atrophy, autosomal dominant
 * Optic atrophy, idiopathic, autosomal recessive
 * Optic atrophy
 * Optic disc drusen
 * Optic nerve coloboma with renal disease
 * Optic nerve disorder
 * Optic nerve hypoplasia, familial bilateral
 * Optic neuritis
 * Optic pathway glioma
 * Opticoacoustic nerve atrophy dementia

Ora–Orn

 * Oral facial digital syndrome type 3
 * Oral facial digital syndrome type 4
 * Oral facial digital syndrome
 * Oral facial dyskinesia
 * Oral leukoplakia
 * Oral lichen planus
 * Oral lichenoid lesions
 * Oral squamous cell carcinoma
 * Oral submucous fibrosis
 * Oral-facial cleft
 * Oral-facial-digital syndrome, type IV
 * Oral-facial-digital syndrome
 * Oral-pharyngeal disorders
 * Organic brain syndrome
 * Organic mood syndrome
 * Organic personality syndrome
 * Organophosphate poisoning
 * Ornithine aminotransferase deficiency
 * Ornithine carbamoyl phosphate deficiency
 * Ornithine transcarbamylase deficiency, hyperammonemia due to
 * Ornithinemia
 * Ornithosis

Oro–Ort

 * Oro acral syndrome
 * Orofaciodigital syndrome Gabrielli type
 * Orofaciodigital syndrome Shashi type
 * Orofaciodigital syndrome Thurston type
 * Orofaciodigital syndrome type 2
 * Orofaciodigital syndrome type1
 * Orotic aciduria hereditary
 * Orotic aciduria purines-pyrimidines
 * Orotidylic decarboxylase deficiency
 * Orstavik Lindemann Solberg syndrome
 * Orthostatic intolerance

Ose–Oss

 * Osebold–Remondini syndrome
 * Osgood–Schlatter disease
 * OSLAM syndrome
 * Osmed syndrome
 * Ossicular malformations, familial

Ostei

 * Osteitis deformans

Osteo
osteo: bone

Osteoa–Osteom
osteocytes
 * Osteoarthritis
 * Osteoarthropathy of fingers familial
 * Osteochondritis deformans juvenile
 * Osteochondritis dissecans
 * Osteochondritis
 * Osteochondrodysplasia thrombocytopenia hydrocephalus
 * Osteochondroma
 * Osteocraniostenosis
 * Osteodysplasia familial Anderson type
 * Osteodysplastic dwarfism Corsello type
 * Osteoectasia familial
 * Osteogenesis Imperfecta
 * Osteogenesis imperfecta congenita microcephaly and cataracts
 * Osteogenesis imperfecta congenital joint contractures
 * Osteogenesis imperfecta retinopathy
 * Osteogenic sarcoma
 * Osteoglophonic dwarfism
 * Osteolysis hereditary multicentric
 * Osteolysis syndrome recessive
 * Osteomalacia
 * Osteomyelitis

Osteon–Osteos

 * Osteonecrosis
 * Osteopathia condensans disseminata with osteopoikilosis
 * Osteopathia striata cranial sclerosis
 * Osteopathia striata pigmentary dermopathy white forelock
 * Osteopetrosis autosomal dominant type 1
 * Osteopetrosis lethal
 * Osteopetrosis renal tubular acidosis
 * Osteopetrosis, (generic term)
 * Osteopetrosis, malignant
 * Osteopetrosis, mild autosomal recessive form
 * Osteopoikilosis
 * Osteoporosis macrocephaly mental retardation blindness
 * Osteoporosis oculocutaneous hypopigmentation syndrome
 * Osteoporosis pseudoglioma syndrome
 * Osteoporosis
 * Osteosarcoma limb anomalies erythroid macrocytosis
 * Osteosclerose type Stanescu
 * Osteosclerosis abnormalities of nervous system and meninges
 * Osteosclerosis autosomal dominant Worth type
 * Osteosclerosis
 * Osteocytes

Oster

 * Ostertag type amyloidosis

Ot–Ox

 * Ota–Appaura syndrome
 * Ota–Kawamura–Ito syndrome
 * Oto-palato-digital syndrome type I and II
 * Otodental syndrome
 * Otofaciocervical syndrome
 * Otoonychoperoneal syndrome
 * Oto-Palatal-digital syndrome
 * Otopalatodigital syndrome type 2
 * Otosclerosis, familial
 * Otosclerosis
 * Otospondylomegaepiphyseal dysplasia
 * Ouvrier–Billson syndrome
 * Ovarian cancer
 * Ovarian carcinosarcoma
 * Ovarian dwarfism as part of Turner syndrome
 * Ovarian dwarfism
 * Ovarian insufficiency due to FSH resistance
 * ovarian remnant syndrome
 * Overfolded helix
 * Overgrowth radial ray defect arthrogryposis
 * Overgrowth syndrome type Fryer
 * Overhydrated hereditary stomatocytosis
 * Overwhelming post-splenectomy infection (OPSI)
 * Oxalosis