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1. unwanted variations in a signal that result from imperfections in transmission; see also signal-to-noise ratio.
2. any disturbance in a visual signal being recorded in radiography; see also mottle.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


1. Unwanted sound, particularly a complex sound that lacks a musical quality because its various frequencies that comprise it are not whole-or-partial number multiples (harmonics) of each other. Compare: harmony.
2. Unwanted additions to a signal not arising at its source; for example, the 60-cycle frequency wave in an electrocardiogram; largely eliminated from machines after 1980 (includes visual noise on imaging studies).
3. Extraneous uncontrolled variables influencing the distibution of measurements in a set of data.
Farlex Partner Medical Dictionary © Farlex 2012


Random variation in signals of the electromagnetic spectrum that carries no useful information from the source.

A term defined in MRI as an undesirable background signal interference or other disturbance, which affects image quality.

Occupational medicine
OSHA requires that anyone with occupational exposure to greater than 89 decibels should wear ear protection.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


Electronics Random variation in signals of the electromagnetic spectrum that carries no useful information from the source. See Cymatics, Music therapy, Sound therapy Technology Poisson noise Fluctuation in the number of information carriers–photons, electrons, which appears as 'snow' in a cathode ray tube, a function of the statistical variation of the rays received by the detector and number of electrons produced by the photomultiplier. See White noise. Cf Chaos, Pink noise.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


1. Unwanted sound, particularly complex sound that lacks a musical quality because the various frequencies of which it is composed are not whole or partial number multiples (harmonics) of each other.
2. Unwanted additions to a signal not arising at its source; includes visual noise on imaging studies.
See: signal:noise ratio
3. Extraneous uncontrolled variables influencing the distibution of measurements in a set of data.
[M.E., fr. O.Fr., fr. L.L. nausea, seasickness]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Patient discussion about noise

Q. what causes the sound of cracking noises in the head all the time it was said i had acute sinusitis but honestly i think it is more . I don't know why i have cracking noises in my head . I am very concerned about this also my neck is always stiff feeling and aching all the time. . My eyes are very tired and i see blue spots and they hurt behind the eye very badly . I have headaches very often

A. wow...that really sounds serious...i have chronic sinusitis and i can tell you i had horrible headaches but nothing like you describe now. i would strongly consider going to a hospital and checking it out...
tell us what was the result!

Q. Tinnitus (Ringing and Other Ear Noise) Anybody have this problem? Urrrrrrrrrrr, I think I want to shoot myself,you know what I mean. It is worst than the chinese torture. Someone, please send me a good tip how to stop it. I have this for 4 yrs and it is driving me crazy. You cannot enjoy total complete silence. They say silence is golden but not when you have this ringgi in your ears. It gets worst when there is no noise. The only remedy I have is eating hot spicy curry, it helps for 2-3 wks and then it comes back again and then eating spicy food again. Listening to classical music helps to. Oh well.....just have to suck it up.

A. I've read that lipoflavinoids can help.

Q. what can cause a migrane other than light, noise, andno sleep? Well its been 4 days n 3 nights that I have it n it dont go away it was bad at first but then my right ear hurted as well as my right upper wisdomteeth It seems to be in only the right side and its been movin down towards my neck... Please if u have any info on wha the fuck is goin on with me let me know asap...

A. A migraine attack can be triggered also by caffeine consumption, alcohol consumption, certain medications, allergic reactions, physical or emotional stress, smoking, skipping meals, menstrual cycle fluctuations, menopause, and certain food containing-
1) tyramine- red wine, aged cheese, smoked fish, chicken liver, figs and some beans.
2) nitrates - like hot dogs, bacon and salami.

More discussions about noise
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References in periodicals archive ?
Manning partners Naoise and all but one of Bolger's remaining four runners in his bid to collar Lordan, but the leader has four decent chances himself.
Polka dot Peter Pan collar dress [euro]55 and, below, cream and black Peter Pan collar dress, [euro]55 Boyfriend denims [euro]38, peach flecked knit [euro]35, PU sleeve parka [euro]75 LS PU panel blazer cream [euro]65, SL Pintuck shell top coral black, [euro]30 Naoise Tan, left, wears floral print dress [euro]65, and Sarah Morrissey wears sequin embellished cami [euro]45 and floral print skirt [euro]40, from A|wear's Spring 2013 collection.
POINTING THE WAY Bob Etchingham, Mary Rose Burke and Crowe Horwath's Naoise Cosgrove
Dublin's new Lord Mayor, Naoise O Muiri, has slammed the drunken violence as totally unacceptable and said it was not a nice image of the country's capital.
A double on the night for Bolger, which was completed half an hour later by the Kevin Manningridden Naoise in the 7f handicap, left him on the 12-winner mark, one behind Eddie Lynam in the winter series.
Mary Rose Burke & Naoise Cosgrave Crowe Horwath
Dublin's new Lord Mayor Naoise O'Muiri is right to condemn this madness as being completely unacceptable.
Six course winners, including two recent scorers Cailin Coillteach and Naoise, are among the 14 runners in the 6f handicap (6.50), with Cailin Coillteach bidding for a hat-trick, having followed up an initial win for Andy Oliver with another success last week on her first run for Willie McCreery.
Fianna Fail councillor Naoise O Cearuil yesterday hit out at the lack of gardai in a town with more than 12,000 students.
Represented in six of the seven races, Bolger will be hoping the consistent Naoise can gain his second success of the series in the 6f handicap (6.50), while Gort Na Mona will be fancied to follow up a recent victory in the 1m2f apprentice handicap (8.20).
Models Danielle Winkworth and Naoise Tan looked just the part evoking a time where the two gangs divided Sixties youth culture as they showcased the new looks from the pursefriendly store.
A new drug that could prevent the growth of triple-negative cells has been researched by PhD student Naoise Synnott.