Dizziness, lightheadedness, and the feeling of passing out is a common complaint in people who have low blood pressure. When the blood pressure is too low, not enough oxygen-rich blood is being delivered to the brain, and its function can be affected. If the brain's blood supply is decreased too much, the person may pass out (syncope). Symptoms may worsen when changing position from lying down or sitting, to standing up. In addition to feeling dizzy, associated symptoms may include: 1  Sweating. 2  Weakness. 3  Nausea and vomiting. 4  Shortness of breath. 5  Chest pain.
http://www.medicinenet.com/dizziness_dizzy/page2.htm
1 Hunger is one of the most common causes of light headedness. 2  Hunger results in drop of blood sugar level, which in turn can trigger an episode of light headedness in an individual. 3  In individuals suffering from diabetes, drop in blood sugar levels is one of the most common causes of dizziness and light headedness.
http://www.simple-remedies.com/home-remedies/dizziness/light-headed-feeling-causes.html
There are a variety of triggers that are the cause of dizzy and lightheaded sensations. The sensations of feeling faint losing your balance can offer clues into why you’re experiencing these symptoms in the first place.
http://www.lifescript.com/health/briefs/w/what_are_the_causes_of_dizzy_and_light_headed_symptoms.aspx
There are several factors that may contribute to the sensation of light headedness. While these factors are further affected by age, lifestyle patterns, gender, etc, some of the common causes of light headedness include the following. 1  Hunger is one of the most common causes of light headedness.
http://www.simple-remedies.com/home-remedies/dizziness/light-headed-feeling-causes.html
While lightheaded feeling can occur suddenly and you may not get enough time to respond to the situation, there are certain things that you can do to prevent injury or a fall, 1  Sit down or lie down the movement you feel uneasy or giddy. 2  Usually episode of light headedness may be accompanied with syncope or fainting.
http://www.simple-remedies.com/home-remedies/dizziness/light-headed-feeling-causes.html
Vertigo is a big culprit in the causes of dizziness and lightheadedness, which can be a result of inflammation of the inner ear or a symptom of a disease that involves excessive fluid buildup in the inner ear. Many prescription medications have dizziness and lightheadedness as a side effect. While there are many possibilities, the more common causes of dizziness and lightheadedness are sudden dramatic drops in blood pressure, low iron levels, low blood sugar and dehydration.
http://www.lifescript.com/health/briefs/w/what_are_the_causes_of_dizzy_and_light_headed_symptoms.aspx
However in some cases light headedness may lead to a spell of fainting or syncope, which increases the risk of injury due to fall. Treatment of light headedness and dizziness depends upon the underlying cause of the condition; however there are some simple tips that can help manage the condition promptly.
http://www.simple-remedies.com/home-remedies/dizziness/light-headed-feeling-causes.html
1 Dehydration (loss of water in the body) often occurs with infections that cause vomiting and diarrhea. 2  Fever also can cause a significant amount of water loss due to increased metabolic rate and excessive sweating as the body tries to cool itself.
http://www.medicinenet.com/dizziness_dizzy/page2.htm
1 Low blood pressure, often caused due to dehydration is another cause of faintness and light headed feeling. 2  Episodes of light headedness often trigger in summers or on exposure to high temperatures are linked with dehydration and fall in blood pressure.
http://www.simple-remedies.com/home-remedies/dizziness/light-headed-feeling-causes.html
1 Light headedness: The medical term for this feeling is “presyncope.” This feeling of being lightheaded can involve feeling dizzy and nauseous, having pale or clammy skin. 2  Blood pressure drop: A sudden drop in your blood pressure can cause this type of dizziness.
http://www.medhelp.org/neurology/articles/Why-Are-You-Dizzy/244
causes of being light headed
A cause of vertigo is of being light headed.