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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 .
Woman experiencing lightheadedness and dizziness. ... certain medications and long-term bed rest can also cause a sudden drop in blood pressure. ... Last, Dr. Shaikh says that feeling lightheaded ...
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 ...
Benign paroxysmal positional vertigo (BPPV) is a disorder arising from a problem in the inner ear. [3] Symptoms are repeated, brief periods of vertigo with movement, characterized by a spinning sensation upon changes in the position of the head. [1] This can occur with turning in bed or changing position. [3]
Alternatively, the last step can be replaced by a reductive N-alkylation with 3-methylbenzaldehyde. The reductive agent is hydrogen, and Raney nickel is used as a catalyst. [28] [29] Meclizine is obtained and used as a racemate, a 1:1 mixture of the two stereoisomers. Drug forms contain the racemic dihydrochloride. [citation needed]
It can cause diarrhea, pale skin, lightheadedness, shortness of breath, swollen and red tongue and bleeding gums. Other symptoms of vitamin B12 deficiency include memory loss, ...
Symptoms can include: [citation needed] A constant sense of unsteadiness, rocking or swaying, dizziness or lightheadedness; Disequilibrium on most days for at least 3 months; Spatial orientation problems; Off-kilter sensation; Extreme sensitivity to movement and/or complex visual stimuli such as grocery stores or driving in certain weather ...
Flicker vertigo, sometimes called the Bucha effect, is "an imbalance in brain-cell activity caused by exposure to low-frequency flickering (or flashing) of a relatively bright light." [ 1 ] It is a disorientation -, vertigo -, and nausea -inducing effect of a strobe light flashing at 1 Hz to 20 Hz, approximately the frequency of human brainwaves .