Light-headedness is a common and often unpleasant sensation of dizziness and/or feeling that one may be about to faint, which may be transient, recurrent, or occasionally chronic. In some cases the individual may feel as though her or his head were weightless. It can be simply an indication of a temporary shortage of blood or oxygen to the brain, low blood pressure, low blood sugar, or anemia. It can also be a symptom of many other conditions, some of them serious, such as heart disease, stroke, or bleeding. Dizziness (Latin: Vertigo) is the sensation of instability. ... Fainting or syncope is a sudden (and generally momentary) loss of consciousness due to a lack of sufficient blood and oxygen reaching the brain. ... The word chronic has uses in many fields. ... Red blood cells (erythrocytes) are present in the blood and help carry oxygen to the rest of the cells in the body Blood is a circulating tissue composed of fluid plasma and cells (red blood cells, white blood cells, platelets). ... General Name, Symbol, Number oxygen, O, 8 Chemical series nonmetals Group, Period, Block 16, 2, p Appearance colorless Atomic mass 15. ... In the anatomy of animals, the brain, or encephalon, is the higher, supervisory center of the nervous system. ... Blood pressure is the pressure exerted by the blood on the walls of the blood vessels. ... In medicine, blood sugar is a term used to refer to levels of glucose in the blood. ... This article discusses the medical condition. ... There are different forms of heart disease: Coronary heart disease Ischaemic heart disease Cardiovascular disease The study of the heart (and diseases of the heart) is Cardiology This is a disambiguation page, a list of pages that otherwise might share the same title. ... A stroke or cerebrovascular accident (CVA) occurs when the blood supply to a part of the brain is suddenly interrupted by occlusion (an ischemic stroke- approximately 90%of strokes) or by hemorrhage (a hemorrhagic stroke - approximately 10% of strokes). ...

Treatment for light-headedness can include drinking plenty of water or other fluids, 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).