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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.
It is the reason for one to three percent of visits to emergency departments and admissions to hospital. [7] Up to half of women over the age of 80 and a third of medical students describe at least one event at some point in their lives. [7] Of those presenting with syncope to an emergency department, about 4% died in the next 30 days. [1]
When anemia is acute, symptoms may include confusion, feeling like one is going to pass out, loss of consciousness, and increased thirst. [1] Anemia must be significant before a person becomes noticeably pale. [1] Additional symptoms may occur depending on the underlying cause. [1] Anemia can be temporary or long term and can range from mild to ...
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 ...
Vertigo is the sensation of spinning or having one's surroundings spin about them. Many people find vertigo very disturbing and often report associated nausea and vomiting. [6] Presyncope describes lightheadedness or feeling faint; the name relates to syncope, which is actually fainting.
Tyramine, like phenethylamine, is a monoaminergic activity enhancer (MAE) of serotonin, norepinephrine, and dopamine in addition to its catecholamine-releasing activity. [ 47 ] [ 48 ] [ 49 ] That is, it enhances the action potential -mediated release of these monoamine neurotransmitters .
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Heat syncope is fainting or dizziness as a result of overheating (syncope is the medical term for fainting). It is a type of heat illness. The basic symptom of heat syncope is fainting, with or without mental confusion. [1] Heat syncope is caused by peripheral vessel dilation, resulting in diminished blood flow to the brain and dehydration.