Disease Reference Index - O

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• O'nyong-nyong fever
• OA
• Obesity hypoventilation syndrome (OHS)
• OBS

• Obsessive-compulsive disorder Obsessive-compulsive disorder is an anxiety disorder characterized by recurrent thoughts, feelings, ideas or sensations (obsessions) or behaviors that makes a person feel driven to perform (compulsions).

• Obsessive-compulsive neurosis

• Obsessive-Compulsive Disorder Read a definition of this disorder, and learn more about the causes and risk factors for developing it.

• Obstruction of the ureteropelvic junction
• Obstructive sleep apnea syndrome
• Obstructive uropathy
• Obstructive uropathy - bilateral - acute
• Obstructive uropathy - bilateral - chronic
• Obstructive uropathy - unilateral - acute
• Obstructive uropathy - unilateral - chronic
• Occlusion - renal artery
• Occlusion - renal vein
• Occupational asthma
• Occupational bronchitis
• Occupational hearing loss
• OCD
• Ochronosis
• Ocular albinism
• Ocular larva migrans
• Ocular melanoma
• Oculocutaneous albinism
• Oculoglandular syndrome
• Oculomotor palsy
• Ogilvie's syndrome
• Ohio River Valley fever
• Oligodendroglioma - adults
• Oligodendroglioma - children
• Olivopontocerebellar atrophy
• Olivopontocerebellar degeneration
• OME
• Omphalocele
• Ondine's curse
• Onychocryptosis
• Onychomycosis
• Oophoritis
• OPCA
• Open angle glaucoma
• Open bite
• Ophthalmia neonatorum
• Opiate withdrawal
• Opioid intoxication
• Oppositional defiant disorder
• Optic glioma
• Optic nerve atrophy
• Optic nerve glioma
• Optic neuritis
• Oral cancer
• Oral thrush
• Oral ulcer
• Orbital cellulitis
• Orbital pseudotumor
• Orchitis
• Organic Brain Syndrome
• Organic mental disorder (OMS)
• Ormond's disease
• Ornithosis
• Orthostatic hypotension
• Osgood-Schlatter disease
• Osler's disease
• Osler-Weber-Rendu syndrome
• Osmotic diuresis
• Osteitis deformans
• Osteitis fibrosa
• Osteitis fibrosa cystica
• Osteoarthritis
• Osteoarthrosis
• Osteochondrosis
• Osteogenesis imperfecta
• Osteogenic sarcoma
• Osteomalacia
• Osteomalacia in children
• Osteomas
• Osteomyelitis
• Osteomyelitis of the skull
• Osteonecrosis
• Osteopenia - premature infants
• Osteoporosis
• Osteosarcoma
• Otitis
• Otitis externa - acute
• Otitis externa - chronic
• Otitis externa - malignant
• Otitis media - acute
• Otitis media - chronic
• Otitis media with effusion
• Otosclerosis
• Otospongiosis
• Ovalocytosis - hereditary
• Ovarian cancer
• Ovarian cysts
• Ovarian hypofunction
• Ovarian overproduction of androgens
• Overactive bladder
• Overactive thyroid
• Overbite
• Overgrowth - intestinal bacteria
• Ovulation pain
• Owren's disease
• Oxyuriasis
• Ozena