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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.
Dizziness is broken down into four main subtypes: vertigo (~25–50%), disequilibrium (less than ~15%), presyncope (less than ~15%), and nonspecific dizziness (~10%). [5] 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]
Feeling lightheaded can also be a sign of low blood sugar, Dr. Shaikh says. This happens because the brain isn’t getting enough glucose, which the brain needs for energy.
[1] [2] Patients with heart failure often experience this when bending over to tie a shoe, putting socks on, or other activities requiring bending downwards. [ 1 ] [ 2 ] It has been defined as occurring within 30 seconds of bending over, but could occur in as few as 8 seconds in severe cases. [ 3 ]
After the prodrome phase, some people also experience an aura starting around 30 minutes before the headache appears. (Migraine with aura is considered a separate condition and comes with an ...
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In many people, it is elicited by bending the head forward. [2] It can also be evoked when a practitioner pounds on the cervical spine while the neck is flexed; this is caused by involvement of the posterior columns. Lhermitte phenomenon is named after the French neurologist Jean Lhermitte. [3]
Following the treatment, the clinician may provide the patient with a soft collar, often worn for the remainder of the day, as a cue to avoid any head positions that may once again displace the otoconia. The patient may be instructed to be cautious of bending over, lying backward, moving the head up and down, or tilting the head to either side.