Nephrolithiasis
Renal calculus that is still present in the kidney
Neuralgia
pain along the course of a nerve
NG tube
Nasogastric tube
Nocturia
Urge to urinate during the night, waking the person from sleep
Nontoxic
Well-appearing, without concern for acute deterioration
NSTEMI
Non-ST-elevation myocardial infarction
Nystagmus
Involuntary eye movements where eyes appear to be shaking
Obturator sign
Pain in the RLQ with internal rotation of the right hip; indicative of appendicitis
Occipital/occiput
Posterior area of head/scalp
Odontalgia
Toothache
Odynophagia
Pain without swallowing
Olecranon
Bony projection of the ulna; "funny bone
Oophorectomy
Removal of an ovary
Opthalmagia
Eye pain
Orchiectomy
Removal of a testicle
Organomegaly
Enlargement of an organ
Oriented x3
Oriented to person, place and time
ORIF
Open reduction and internal fixation of a broken bone
Oropharynx
Posterior mouth meeting the superior aspect of the throat
OS
Opening of the orifice
Osteomyelitis
Bone infection
Otalgia
Earache
Otitis externa
Outer ear infection, "swimmer's ear
Otitis media
Middle ear infection
Ovarian torsion
Twisting of the ovarian blood vessels