Diseases Starting with 'O'

Obesity
Oblique facial clefting 1
Obsessive-compulsive disorder
Obsessive-compulsive personality disorder
Obstructive hydrocephalus
Obstructive jaundice
Obstructive lung disease
Obstructive nephropathy
Obstructive sleep apnea
Occipital horn syndrome
Occlusion precerebral artery
Occult macular dystrophy
Occupational asthma
Occupational dermatitis
Ochronosis
Ocular albinism 1
Ocular albinism with sensorineural deafness
Ocular cancer
Ocular hyperemia
Ocular melanoma
Ocular motility disease
Ocular motor apraxia, cogan type
Ocular tuberculosis
Oculoauricular syndrome
Oculocerebrorenal syndrome
Oculocutaneous albinism
Oculocutaneous albinism type ia
Oculocutaneous albinism type ib
Oculocutaneous albinism type ii
Oculocutaneous albinism type iii
Oculocutaneous albinism type iv
Oculocutaneous albinism type v
Oculocutaneous albinism type vi
Oculocutaneous albinism type vii
Oculodentodigital dysplasia
Oculoectodermal syndrome
Oculoglandular tularemia
Oculogyric crisis
Oculomotor nerve paralysis
Oculopharyngeal muscular dystrophy
Oculopharyngodistal myopathy
Oculopharyngodistal myopathy 1
Oculopharyngodistal myopathy 2
Oculopharyngodistal myopathy 3
Oculopharyngodistal myopathy 4
Odontoclasia
Oesophagostomiasis
Ogden syndrome
Oguchi disease-1
Oguchi disease-2
Ohdo syndrome
Ohdo syndrome, sbbys variant
Olecranon bursitis
Olfactory nerve disease
Olfactory neuroblastoma
Oligoasthenoteratozoospermia
Oligodendroglioma
Oligodendroglioma, idh-mutant and 1p/19q-codeleted grade 2
Oligodendroglioma, idh-mutant and 1p/19q-codeleted, grade 3
Oligohydramnios
Oligomeganephronia
Oligospermia
Oliver-mcfarlane syndrome
Olivopontocerebellar atrophy
Ollier disease
Omenn syndrome
Omodysplasia
Omodysplasia 1
Omodysplasia 2
Omphalocele
Onchocerciasis
O'nyong'nyong fever
Oophoritis
Open-angle glaucoma
Ophthalmomyiasis
Ophthalmoplegia
Opiate dependence
Opioid abuse
Opisthorchiasis
Opitz gbbb syndrome
Opportunistic bacterial infectious disease
Opportunistic mycosis
Oppositional defiant disorder
Optic atrophy
Optic atrophy 1
Optic atrophy 10
Optic atrophy 11
Optic atrophy 12
Optic atrophy 2
Optic atrophy 3
Optic atrophy 4
Optic atrophy 5
Optic atrophy 6
Optic atrophy 7
Optic atrophy 8
Optic atrophy 9
Optic disc anomalies with retinal and/or macular dystrophy
Optic disk drusen
Optic nerve astrocytoma
Optic nerve disease
Optic nerve glioma
Optic nerve neoplasm
Optic nerve sheath meningioma
Optic neuritis
Optic papillitis
Oral candidiasis
Oral cavity carcinoma in situ
Oral hairy leukoplakia
Oral leukoedema
Oral rhabdomyosarcoma
Oral squamous cell carcinoma
Oral submucous fibrosis
Oral tuberculosis
Orange allergy
Orbital cancer
Orbital cellulitis
Orbital cyst
Orbital granuloma
Orbital osteomyelitis
Orbital periostitis
Orbital tenonitis
Orbit alveolar rhabdomyosarcoma
Orbit embryonal rhabdomyosarcoma
Orbit rhabdomyosarcoma
Orchitis
Organic acidemia
Organophosphate-induced delayed polyneuropathy
Organ system benign neoplasm
Organ system cancer
Ornithine translocase deficiency
Ornithosis
Orofacial cleft
Orofacial cleft 1
Orofacial cleft 10
Orofacial cleft 11
Orofacial cleft 12
Orofacial cleft 13
Orofacial cleft 14
Orofacial cleft 15
Orofacial cleft 2
Orofacial cleft 3
Orofacial cleft 4
Orofacial cleft 5
Orofacial cleft 6
Orofacial cleft 7
Orofacial cleft 8
Orofacial cleft 9
Orofaciodigital syndrome
Orofaciodigital syndrome i
Orofaciodigital syndrome ii
Orofaciodigital syndrome iii
Orofaciodigital syndrome iv
Orofaciodigital syndrome ix
Orofaciodigital syndrome v
Orofaciodigital syndrome vii
Orofaciodigital syndrome viii
Orofaciodigital syndrome x
Orofaciodigital syndrome xi
Orofaciodigital syndrome xiv
Orofaciodigital syndrome xix
Orofaciodigital syndrome xvi
Orofaciodigital syndrome xvii
Orofaciodigital syndrome xviii
Orofaciodigital syndrome xx
Oromandibular dystonia
Oropharyngeal anthrax
Oropouche fever
Orotic aciduria
Osmotic diarrhea
Ossification of the posterior longitudinal ligament of spine
Ossifying fibroma
Ossifying fibromyxoid tumor
Osteitis fibrosa
Osteoarthritis
Osteoblastoma
Osteochondritis dissecans
Osteochondrodysplasia
Osteogenesis imperfecta
Osteogenesis imperfecta type 1
Osteogenesis imperfecta type 10
Osteogenesis imperfecta type 11
Osteogenesis imperfecta type 12
Osteogenesis imperfecta type 13
Osteogenesis imperfecta type 14
Osteogenesis imperfecta type 15
Osteogenesis imperfecta type 16
Osteogenesis imperfecta type 17
Osteogenesis imperfecta type 18
Osteogenesis imperfecta type 19
Osteogenesis imperfecta type 2
Osteogenesis imperfecta type 20
Osteogenesis imperfecta type 21
Osteogenesis imperfecta type 3
Osteogenesis imperfecta type 4
Osteogenesis imperfecta type 5
Osteogenesis imperfecta type 6
Osteogenesis imperfecta type 7
Osteogenesis imperfecta type 8
Osteogenesis imperfecta type 9
Osteogenesis imperfecta with opalescent teeth, blue sclerae and wormian bones but without fractures
Osteoglophonic dysplasia
Osteomalacia
Osteomyelitis
Osteonecrosis
Osteopathia striata with cranial sclerosis
Osteopetrosis
Osteopoikilosis
Osteoporosis
Osteoporosis-pseudoglioma syndrome
Osteosarcoma
Osteosclerosis
Osteosclerotic metaphyseal dysplasia
Ostertagiasis
Otitis externa
Otitis interna
Otitis media
Otomycosis
Otopalatodigital syndrome spectrum disorder
Otopalatodigital syndrome type 1
Otopalatodigital syndrome type 2
Otorrhea
Otosalpingitis
Otosclerosis
Otosclerosis 1
Otosclerosis 10
Otosclerosis 11
Otosclerosis 2
Otosclerosis 3
Otosclerosis 4
Otosclerosis 5
Otosclerosis 7
Otosclerosis 8
Otospondylomegaepiphyseal dysplasia, autosomal dominant
Otospondylomegaepiphyseal dysplasia, autosomal recessive
Otulipenia
Ovarian angiosarcoma
Ovarian benign neoplasm
Ovarian biphasic or triphasic teratoma
Ovarian brenner tumor
Ovarian cancer
Ovarian carcinoma
Ovarian carcinosarcoma
Ovarian clear cell adenocarcinoma
Ovarian clear cell adenofibroma
Ovarian clear cell carcinoma
Ovarian clear cell cystadenofibroma
Ovarian clear cell malignant adenofibroma
Ovarian cyst
Ovarian cystadenocarcinoma
Ovarian cystadenoma
Ovarian cystic teratoma
Ovarian disease
Ovarian dysfunction
Ovarian dysgenesis 1
Ovarian dysgenesis 2
Ovarian dysgenesis 3
Ovarian dysgenesis 4
Ovarian dysgenesis 5
Ovarian dysgenesis 6
Ovarian dysgenesis 7
Ovarian dysgenesis 8
Ovarian embryonal carcinoma
Ovarian endodermal sinus tumor
Ovarian endometrial cancer
Ovarian endometrioid adenofibroma
Ovarian endometrioid malignant adenofibroma
Ovarian endometrioid stromal sarcoma
Ovarian fetiform teratoma
Ovarian germ cell cancer
Ovarian germ cell monodermal and highly specialized teratoma
Ovarian germ cell teratoma
Ovarian gonadoblastoma
Ovarian hyperstimulation syndrome
Ovarian large-cell neuroendocrine carcinoma
Ovarian lymphoma
Ovarian malignant mesothelioma
Ovarian melanoma
Ovarian mesodermal adenosarcoma
Ovarian mixed germ cell neoplasm
Ovarian mucinous adenocarcinoma
Ovarian mucinous adenofibroma
Ovarian mucinous cystadenocarcinoma
Ovarian mucinous malignant adenofibroma
Ovarian mucinous neoplasm
Ovarian papillary cystadenoma
Ovarian papillary neoplasm
Ovarian primitive germ cell tumor
Ovarian serous adenofibroma
Ovarian serous carcinoma
Ovarian serous cystadenocarcinoma
Ovarian sex cord-stromal benign neoplasm
Ovarian sex-cord stromal tumor
Ovarian small cell carcinoma
Ovarian solid teratoma
Ovarian squamous cell carcinoma
Ovarian surface papilloma
Ovarian wilms' cancer
Ovary adenocarcinoma
Ovary epithelial cancer
Ovary leiomyosarcoma
Ovary neuroendocrine neoplasm
Ovary papillary carcinoma
Ovary rhabdomyosarcoma
Ovary sarcoma
Ovary serous adenocarcinoma
Ovary transitional cell carcinoma
Overactive bladder syndrome
Overhydrated hereditary stomatocytosis
Overnutrition
Oxirane allergy
Oxoglutarate dehydrogenase deficiency
Oxyphilic adenoma