Conditions A–Z
Plain-language reference entries for diseases, symptoms and tests.
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- O'nyong-nyong fever
- OCD
- OCG
- OFC
- OME
- OPCA
- Obesity
- Obesity hypoventilation syndrome (OHS)
- Obsessive-Compulsive Disorder
- Obsessive-compulsive disorder [1]
- Obsessive-compulsive neurosis
- Obsessive-compulsive personality disorder
- Obstetric sonogram
- Obstetric ultrasonography
- Obstructed airway
- Obstruction of the ureteropelvic junction
- Obstructive sleep apnea
- Obstructive sleep apnea syndrome
- Obstructive uropathy
- Obstructive uropathy - bilateral - acute
- Obstructive uropathy - bilateral - chronic
- Obstructive uropathy - unilateral - acute
- Obstructive uropathy - unilateral - chronic
- Obtundation
- Occipital-frontal circumference
- Occlusion - renal artery
- Occlusion - renal vein
- Occupational asthma
- Occupational bronchitis
- Occupational hearing loss
- Ochronosis
- Ocular albinism
- Ocular larva migrans
- Ocular melanoma
- Ocular motility examinatin
- Oculocutaneous albinism
- Oculoglandular syndrome
- Oculomotor palsy
- Odynophagia
- Oesophagitis
- Ogilvie's syndrome
- Ohio River Valley fever
- Oil of wintergreen
- Oily hair
- Oily skin
- Oleander
- Oliguria
- Olivopontocerebellar atrophy
- Olivopontocerebellar degeneration
- Omphalocele
- Omphalocele repair
- Ondine's curse
- Onychocryptosis
- Onychomycosis
- Onychomycosis (Toenail Fungus)
- Oophoritis
- Open angle glaucoma
- Open bite
- Open browlift
- Open cholecystectomy
- Open heart surgery
- Open incisional biopsy
- Open injury bleeding
- Open lung biopsy
- Open pleural biopsy
- Open prostatectomy
- Open wound
- Ophthalmalgia
- Ophthalmia neonatorum
- Ophthalmoscopy
- Opiate withdrawal
- Opioid intoxication
- Opisthotonos
- Oppositional defiant disorder
- Optic glioma
- Optic nerve atrophy
- Optic nerve glioma
- Optic neuritis
- Optic-Nerve Swelling (Papilledema)
- Oral Cavity Cancer
- Oral cancer
- Oral cholecystogram
- Oral glucose tolerance test
- Oral hypoglycemics overdose
- Oral thrush
- Oral ulcer
- Orbit CT scan
- Orbital cellulitis
- Orbital pseudotumor
- Orbital-craniofacial surgery
- Orchidopexy
- Orchiopexy
- Orchitis
- Orchitis and Epididymitis
- Organ donation
- Organic brain syndrome
- Organic brain syndrome
- Organic mental disorder
- Orgasmic dysfunction
- Orientation
- Ormond's disease
- Ornamental pepper
- Ornithosis
- Oropharynx lesion biopsy
- Orthopnea
- Orudis
- Osgood-Schlatter Disease
- Osgood-Schlatter disease
- Osgood-Schlatter disease
- Osler's disease
- Osler-Weber-Rendu syndrome
- Osler-Weber-Rendu syndrome
- Osmolality
- Osmolality - urine
- Osmotic diuresis
- Osmotic fragility
- Osteitis deformans
- Osteitis fibrosa
- Osteitis fibrosa cystica
- Osteoarthritis
- Osteoarthritis
- Osteoarthritis
- Osteoarthrosis
- Osteochondrosis
- Osteogenesis imperfecta
- Osteogenic sarcoma
- Osteomalacia
- Osteomalacia in children
- Osteomyelitis
- Osteomyelitis of the skull
- Osteoporosis
- Osteoporosis
- Osteoporosis [1]
- Osteoporosis and aging
- Osteosarcoma
- Osteosarcoma
- Otalgia
- Otitis
- Otitis Media (Ear Infection)
- Otitis externa - acute
- Otitis externa - chronic
- Otitis externa - malignant
- Otitis media - acute
- Otitis media - chronic
- Otitis media with effusion
- Otoplasty
- Otorrhea
- Otosclerosis
- Otoscope
- Otospongiosis
- Ovalocytosis - hereditary
- Ovarian Cancer
- Ovarian cancer
- Ovarian cancer dangers
- Ovarian cysts
- Ovarian growths
- Ovarian hypofunction
- Ovarian hypofunction
- Ovarian mass
- Ovarian overproduction of androgens
- Oven cleaners
- Over-the-counter birth control
- Overactive bladder
- Overactive thyroid
- Overbite
- Overbreathing
- Overcoming breastfeeding problems
- Overdose from drugs
- Overweight
- Ovulation pain
- Ovulation prediction test
- Owren's disease
- Oxalic acid
- Oxazepam overdose
- Oxyuriasis
- Oxyuriasis test
- Ozena