WordNet

very thin and insubstantial; "thin paper"; "light summer dresses"
make lighter or brighter; "This lamp lightens the room a bit" (同)illume, illumine, light_up, illuminate
a condition of spiritual awareness; divine illumination; "follow Gods light" (同)illumination
having abundant light or illumination; "they played as long as it was light"; "as long as the lighting was good" (同)lighting
(physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window" (同)visible_light, visible_radiation
any device serving as a source of illumination; "he stopped the car and turned off the lights" (同)light_source
the visual effect of illumination on objects or scenes as created in pictures; "he could paint the lightest light and the darkest dark" (同)lightness
a particular perspective or aspect of a situation; "although he saw it in a different light, he still did not understand"
a person regarded very fondly; "the light of my life"
a visual warning signal; "they saw the light of the beacon"; "there was a light at every corner"
an illuminated area; "he stepped into the light"
mental understanding as an enlightening experience; "he finally saw the light"; "can you shed light on this problem?"
public awareness; "it brought the scandal to light"
(used of color) having a relatively small amount of coloring agent; "light blue"; "light colors such as pastels"; "a light-colored powder" (同)light-colored
moving easily and quickly; nimble; "the dancer was light and graceful"; "a lightsome buoyant step"; "walked with a light tripping step" (同)lightsome, tripping
having relatively few calories; "diet cola"; "light (or lite) beer"; "lite (or light) mayonnaise"; "a low-cal diet" (同)lite, low-cal, calorie-free
less than the correct or legal or full amount often deliberately so; "a light pound"; "a scant cup of sugar"; "regularly gives short weight" (同)scant, short
(of sleep) easily disturbed; "in a light doze"; "a light sleeper"; "a restless wakeful night" (同)wakeful
(physics, chemistry) not having atomic weight greater than average; "light water is ordinary water"
(used of soil) loose and large-grained in consistency; "light soil"
characterized by or emitting light; "a room that is light when the shutters are open"; "the inside of the house was airy and light"
demanding little effort; not burdensome; "light housework"; "light exercise"
designed for ease of movement or to carry little weight; "light aircraft"; "a light truck"
easily assimilated in the alimentary canal; not rich or heavily seasoned; "a light diet"
having little importance; "losing his job was no light matter"
intended primarily as entertainment; not serious or profound; "light verse"; "a light comedy"
not great in degree or quantity or number; "a light sentence"; "a light accent"; "casualties were light"; "light snow was falling"; "light misty rain"; "light smoke from the chimney"
of comparatively little physical weight or density; "a light load"; "magnesium is a light metal--having a specific gravity of 1.74 at 20 degrees C"
of little intensity or power or force; "the light touch of her fingers"; "a light breeze"
of the military or industry; using (or being) relatively small or light arms or equipment; "light infantry"; "light cavalry"; "light industry"; "light weapons"
psychologically light; especially free from sadness or troubles; "a light heart"
apparatus for supplying artificial light effects for the stage or a film
the craft of providing artificial light; "an interior decorator must understand lighting"
set afire or burning; "the lighted candles"; "a lighted cigarette"; "a lit firecracker" (同)lit

PrepTutorEJDIC

〈U〉『光,光線』;明るさ / 〈U〉夜明け;日中;日光 / 〈C〉『明かり』(太陽・灯火など光を出すもの) / 〈U〉《時にa~》光輝(brightness),(目などの)輝き / 〈C〉(点火するための)火,火花 / 〈C〉明かり採り,採光窓 / 〈C〉《通例単数形で》(絵などの)明るい部分 / 〈U〉(…についての)知識,情報,理解《+『on』+『名』》 / 〈C〉(ものを見る)観点,見地;相 / 〈C〉この世に光を与える人;指導的な人物 / …‘に'『火をつける』《+『up』+『名』+『名』+『up』》 / …‘に'『明かりをつける』,‘を'照らす《+『up』+『名,』+『名』+『up』》 / 〈人〉‘を'明かりをつけて案内する / 〈表情など〉‘を'明るくする《+『up』+『名,』+『名』+『up』》 / 〈物が〉火がつく,点火する;明かりがつく《+『up』》 / 明るくなる,晴れ晴れする《+『up』》 / 『明るい』 / (色が)『薄い』
(重量が)『軽い』 / (いろいろな事について,その程座・量が)軽い,小さい / 『軽快な』 / 軽装の / 肩のこらない;気軽な / 手軽な,骨の折れなし / (食べ物が)消化のよい,もたれない / ふらふらする,目まいのする / アルコール分の少ない / (パンなどが)ふんわりした / (重量が)軽く / (程度が)軽く,容易に;軽装で
(車・馬などから)降りる《+『from』+『名』》(alight) / (木などに)〈鳥などが〉止まる《+『on』(『upon』)+『名』》 / (…に)〈打撃・運などが〉突然ふりかかる《+『on』(『upon』)+『名』》
照明,点火 / 照明方法(装置)
(羊・豚などの)肺臓

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/01/02 03:53:39」(JST)

wiki en

[Wiki en表示]

Lightheadedness is a common and typically unpleasant sensation of dizziness^[1] and/or a feeling that one may faint. The sensation of lightheadedness can be short-lived, prolonged, or, rarely, recurring. In addition to dizziness, the individual may feel as though his or her head is weightless. The individual may also feel as though the room is what causes the "spinning" or moving (vertigo) associated with lightheadedness. Most causes of lightheadedness are not serious and either cure themselves quickly or are easily treated.

Keeping a sense of balance requires the brain to process a variety of information received from the eyes, the nervous system, and the inner ears. If the brain is unable to process these signals, such as messages are contradictory, or if the sensory systems are improperly functioning, an individual may experience lightheadedness or dizziness.

Causes

Lightheadedness can be simply (and most commonly) an indication of a temporary shortage of blood or oxygen to the brain due to a drop in blood pressure, rapid dehydration from vomiting, diarrhea, or fever, or from playing a wind instrument. Other causes are: low blood sugar, hyperventilation, Postural Orthostatic Tachycardia Syndrome, panic attacks, and anemia. It can also be a symptom of many other conditions, some of them serious, such as heart problems (including abnormal heart rhythm or heart attack), respiratory problems such as pulmonary embolism, and also stroke, bleeding, and shock. If any of these serious disorders is present, the individual will usually have additional symptoms such as chest pain, a feeling of a racing heart, loss of speech or change in vision.

Many people, especially as they age, experience lightheadedness if they arise too quickly from a lying or seated position. Lightheadedness often accompanies the flu, hypoglycaemia, common cold, or allergies. Dizziness could be provoked by the use of antihistamine drugs, like levocetirizine or by some antibiotics or SSRIs. Nicotine or tobacco products can cause lightheadedness for inexperienced users.

Treatment

Treatment for lightheadedness depends on the cause or underlying problem. Treatment may include drinking plenty of water or other fluids (unless the lightheadedness is the result of water intoxication in which case drinking water is quite dangerous). If a sufferer is unable to keep fluids down from nausea or vomiting, they may need intravenous fluid. Sufferers should try eating something sugary and lying down or sitting and reducing the elevation of the head relative to the body (for example, by positioning the head between the knees).

Other simple remedies include avoiding sudden changes in posture when sitting or lying and avoiding bright lights.

Several essential electrolytes are excreted when the body perspires. When people are out in unusual or extreme heat for a long time, sweating excessively can cause a lack of some electrolytes, which in turn can cause lightheadedness.

References

^ "Chapter 14: Evaluation of the Dizzy Patient". Retrieved 2009-08-06.

The MedlinePlus Medical Encyclopedia

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 回転性めまいの病態生理、病因、および鑑別診断 pathophysiology etiology and differential diagnosis of vertigo
2. 回転性めまい患者の評価 evaluation of the patient with vertigo
3. 小児や青年に起きる失神の緊急評価 emergency evaluation of syncope in children and adolescents
4. 白斑を除く後天性色素脱失症 acquired hypopigmentation disorders other than vitiligo
5. 癌の治療中や治療後の小児に起きる睡眠障害 sleep disorders during and after cancer in children

English Journal

Diving accidents: a cohort study from the Netherlands.

Smithuis JW1, Gips E2, van Rees Vellinga TP3, Gaakeer MI4.
International journal of emergency medicine.Int J Emerg Med.2016 Dec;9(1):14. doi: 10.1186/s12245-016-0109-4. Epub 2016 Mar 12.
BACKGROUND: Diving is, besides professional reasons, an increasingly popular leisure activity. Whilst statistically compared to other sports safe, diving accidents can result in serious complications. In order to treat this specific patient category adequately, early diagnosis is important. In this
PMID 26968856

Phenotypic features of chronic migraine.

Yalın OÖ1, Uluduz D2, Özge A3, Sungur MA4, Selekler M5, Siva A2.
The journal of headache and pain.J Headache Pain.2016 Dec;17(1):26. doi: 10.1186/s10194-016-0616-y. Epub 2016 Mar 15.
BACKGROUND: Chronic migraine is a disabling, under-recognized, and undertreated disorder that increases health burdens. The aim of this study was to evaluate phenotypic features and the relevance of accompanying symptoms of migraine attacks in chronic migraine.METHOD: This study was conducted as par
PMID 26975363

Appeal of electronic cigarettes in smokers with serious mental illness.

Pratt SI1, Sargent J2, Daniels L3, Santos MM4, Brunette M5.
Addictive behaviors.Addict Behav.2016 Aug;59:30-4. doi: 10.1016/j.addbeh.2016.03.009. Epub 2016 Mar 19.
INTRODUCTION: Up to 75% of people with serious mental illness (SMI) smoke, and most are highly dependent on nicotine, consuming more cigarettes per day than smokers without mental illness. Even with evidence-based treatment, relapses are common, resulting in high morbidity and early mortality from t
PMID 27043170

Japanese Journal

失神を契機に発見された高齢者未破裂バルサルバ洞動脈瘤の１例

堀口愛,池田俊太郎,山根健一,泉直樹,大島弘世,石橋堅,大島清孝,濱田希臣
日本老年医学会雑誌 46(3), 259-263, 2009
高齢者の失神は，加齢に伴う変化や薬物による影響を受けやすい．また原因が多岐にわたるため，診断に難渋する例も多く，詳細な問診や身体診察が診断に重要である．今回失神が診断の契機となったバルサルバ洞動脈瘤の1例を経験した．症例は78歳男性．数カ月前より怒責時の失神を認めるようになったため精査加療目的で当院に入院した．聴診所見上，胸骨左縁にLevine2度の収縮期雑音を聴取した．心電図で右側胸部誘導に陰 …
NAID 130004485618

Menstrual Disorders and their Influence on Low Back Pain among Japanese Nurses

, , , , , ,
Industrial Health 47(3), 301-312, 2009
… Nurses reported a wide range of symptoms both prior to and during menstruation, including breast tenderness, stomach pain, light headedness and fatigue. …
NAID 130004483377

Percutaneous Transluminal Angioplasty and Stent Placement for Subclavian Steal Syndrome With Concomitant Anterograde Flow in the Left Internal Mammary Artery Graft for Coronary Artery Bypass : Case Report

, , , , , , ,
Neurologia medico-chirurgica 43(10), 488-492, 2003-10-15
… He was admitted with a history of oppressive sensation in the chest, dizziness, and light headedness on exertion for 2 weeks in March 2002. …
NAID 110002277059