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Episodes of vasovagal syncope are typically recurrent and usually occur when the predisposed person is exposed to a specific trigger. Before losing consciousness, the individual frequently experiences early signs or symptoms such as lightheadedness, nausea, the feeling of being extremely hot or cold (accompanied by sweating), ringing in the ears, an uncomfortable feeling in the heart, fuzzy ...
It is caused by a cold substance touching the roof of the mouth, and is believed to result from a nerve response causing rapid constriction and swelling of blood vessels, [3] "referring" pain from the roof of the mouth to the head. [4] [5] The rate of intake for cold foods has been studied as a contributing factor.
Lightheadedness is a common and typically unpleasant sensation of dizziness [1] 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 their head is weightless.
Syncope ((syncope ⓘ), commonly known as fainting or passing out, is a loss of consciousness and muscle strength characterized by a fast onset, short duration, and spontaneous recovery. [1] It is caused by a decrease in blood flow to the brain, typically from low blood pressure. [1]
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The alleged mechanism for the feeling of a crash is correlated with an abnormally rapid rise in blood glucose after eating. This normally leads to insulin secretion (known as an insulin spike ), which in turn initiates rapid glucose uptake by tissues, either storing it as glycogen or fat , or using it for energy production.
People with food aversions usually have a strong reaction when they see, smell or taste foods they don't like, Boswell says. "Some people will cough, gag or vomit when exposed to these foods," she ...
There is some evidence of the existence of a so-called "adrenergic postprandial syndrome": the blood glucose level is normal, and the symptoms are caused through autonomic adrenergic response. [6] Often, this syndrome is associated with emotional distress and anxious behaviour of the patient. [7] [8]