WordNet

having no symptoms of illness or disease (同)symptomless
having a frequency below or above the range of human audibility; "a silent dog whistle"
marked by absence of sound; "a silent house"; "soundless footsteps on the grass"; "the night was still" (同)soundless, still
implied by or inferred from actions or statements; "gave silent consent"; "a tacit agreement"; "the understood provisos of a custody agreement" (同)tacit, understood
not made to sound; "the silent `h at the beginning of `honor"; "in French certain letters are often unsounded" (同)unsounded
relating to the stage in the development of a disease before the symptoms are observed

PrepTutorEJDIC

『音がしない』,静かな / 『沈黙の』,口に出さない;音をたてない・無口の・《補語にのみ用いて》(…について)意見を述べていない,触れていない《+『about』(『on』)+『名』》 / 活動していない・(映画が)無声の・(文字が)発音されない・無声映画

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/05/09 02:24:59」(JST)

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Pulmonary contusion due to trauma is an example of a condition that can be asymptomatic with half of people showing no signs at the initial presentation since such symptoms can take time to develop. The CT scan shows a pulmonary contusion (red arrow) accompanied by a rib fracture (purple arrow).

In medicine, a disease is considered asymptomatic if a patient is a carrier for a disease or infection but experiences no symptoms. A condition might be asymptomatic if it fails to show the noticeable symptoms with which it is usually associated. Asymptomatic infections are also called subclinical infections. The term clinically silent is also used.

Knowing that a condition is asymptomatic is important because:

It may develop symptoms later and so require watch and wait or early treatment.
It may resolve itself or become benign.
It is required that a person undergoes treatment so it does not cause later medical problems such as high blood pressure and hyperlipidaemia.^[1]
Be alert to possible problems: asymptomatic hypothyroidism makes a person vulnerable to Wernicke-Korsakoff syndrome or beri-beri following intravenous glucose.^[2]
The affected person may be infectious and unknowingly spread the infection to others.

An example of an asymptomatic disease is Cytomegalovirus (CMV) which is a member of the herpes virus. "It is estimated that 1% of all newborns are infected with CMV, but the majority of infections are asymptomatic." (Knox, 1983; Kumar et al. 1984)^[3]

Conditions

Asymptomatic conditions may not be discovered until the patient undergoes medical tests (X-rays or other investigations). Some people may remain asymptomatic for a remarkably long period of time; such as people with some forms of cancer. If a patient is asymptomatic, precautionary steps must be taken.

A patient's individual genetic makeup may delay or prevent the onset of symptoms.

List

These are conditions for which there is a sufficient number of documented individuals that are asymptomatic that it is clinically noted. For a complete list of asymptomatic infections see subclinical infection.

Balanitis xerotica obliterans
Benign lymphoepithelial lesion
Cardiac shunt
Carotid artery dissection
Carotid bruit
Cavernous hemangioma
Chloromas (Myeloid sarcoma)
Chronic myelogenous leukemia
Coeliac disease
Coronary Artery Disease
Diabetic retinopathy
Essential Fructosuria
Folliculosebaceous cystic hamartoma
Glioblastoma multiforme (occasionally)
Glucocorticoid remediable aldosteronism
Glucose-6-phosphate dehydrogenase deficiency
Hereditary elliptocytosis
Heterophoria
Hypertension (high blood pressure)
Histidinemia
Hyperaldosteronism
hyperlipidaemia
Hyperprolinemia type I
Hypothyroidism
Idiopathic thrombocytopenic purpura
Iridodialysis (when small)
Lesch-Nyhan syndrome (female carriers)
Levo-Transposition of the great arteries
Meckel's diverticulum
Microvenular hemangioma
Mitral valve prolapse
Monoclonal B-cell lymphocytosis
Myelolipoma
Optic disc pit
Osteoporosis
Pes cavus
Polyorchidism
Pre-eclampsia
Prehypertension
Protrusio acetabuli
Pulmonary contusion
Renal tubular acidosis
Spermatocele
Sphenoid wing meningioma
Spider angioma
Splenic infarction (though not typically)
Subarachnoid hemorrhage
Tonsillolith
Type II diabetes
Vaginal intraepithelial neoplasia
Wilson's disease

References

^ Tattersall, R (2001). "Diseases the doctor (or autoanalyser) says you have got". Clinical Medicine (London) 1 (3): 230–3. doi:10.7861/clinmedicine.1-3-230. PMID 11446622.
^ Watson, A. J.; Walker, J. F.; Tomkin, G. H.; Finn, M. M.; Keogh, J. A. (1981). "Acute Wernickes encephalopathy precipitated by glucose loading". Irish journal of medical science 150 (10): 301–303. doi:10.1007/BF02938260. PMID 7319764. edit
^ Vinson, B. (2012). Language Disorders Across the Lifespan. p. 94. Clifton Park, NY: Delmar

UpToDate Contents

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1. 無症候性細菌尿のある成人に対するアプローチ approach to the adult with asymptomatic bacteriuria
2. Management and outcome of neonatal hypoglycemia
3. 無症候性頸動脈アテローム性動脈硬化症のマネージメント management of asymptomatic carotid atherosclerotic disease
4. 無症候性左室機能不全に対するスクリーニング screening for asymptomatic left ventricular dysfunction
5. Diagnosis of celiac disease in children

English Journal

Pregnancy outcomes among women with hemoglobin E trait.

Kemthong W1, Jatavan P1, Traisrisilp K1, Tongsong T1.
The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians.J Matern Fetal Neonatal Med.2016 Apr;29(7):1146-8. doi: 10.3109/14767058.2015.1038515. Epub 2015 Apr 29.
OBJECTIVE: To compare the maternal and fetal outcomes between pregnant women complicated with hemoglobin E (HbE) trait and normal controls.PATIENTS AND METHODS: A retrospective cohort study was conducted by assessment of the database of maternal-fetal medicine units from January 2003 to December 201
PMID 25923241

Early screening for critical congenital heart defects in asymptomatic newborns in Bursa province.

Özalkaya E1, Akdağ A2, Şen I2, Cömert E2, Melek Yaren H2.
The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians.J Matern Fetal Neonatal Med.2016 Apr;29(7):1105-7. doi: 10.3109/14767058.2015.1035642. Epub 2015 Apr 22.
OBJECTIVE: In this study, pulse oximetry screening results in the early diagnosis of critical congenital heart diseases (CCHD) will be evaluated.METHODS: Eight-thousand two-hundred and eight of 10 200 newborns born between January 2014 and December 2014 were screened using pulse oximetry for the d
PMID 25902399

The APC I1307K allele conveys a significant increased risk for cancer.

Leshno A1, Shapira S1, Liberman E1, Kraus S1, Sror M1, Harlap-Gat A1, Avivi D1, Galazan L1, David M1, Maharshak N1,2, Moanis S1, Arber N1,2, Moshkowitz M1,2.
International journal of cancer. Journal international du cancer.Int J Cancer.2016 Mar 15;138(6):1361-7. doi: 10.1002/ijc.29876. Epub 2015 Oct 13.
This study is the first attempt to evaluate the association between the APC I1307K variant and overall cancer risk. It is unique in both its large sample size and in the reliability of data in the control group. The findings described in this article have major implications in terms of identifying a
PMID 26421687

Japanese Journal

症例大腸癌術前検査中に偶然発見され無症状で経過した上腸間膜静脈血栓症の1例

大倉史典,百名祐介,下位洋史 [他]
外科 = Surgey : 臨床雑誌 77(10), 1188-1191, 2015-10
NAID 40020597805

On-going malaria transmission in The Gambia despite high coverage of control interventions: a nationwide cross-sectional survey

Mwesigwa Julia,Okebe Joseph,Affara Muna,Di Tanna Gian Luca,Nwakanma Davis,Janha Omar,Opondo Kevin,Grietens Koen Peeters,Achan Jane,D'Alessandro Umberto
Malaria Journal 14, 314, 2015-08-14
… Across all sites, 51.17 % (745/1,456) of infections were asymptomatic and 35.61 % (448/1,258) were sub-microscopic. …
NAID 120005649207