Webster's New World Medical Dictionary

diverticulum, Meckel
An outpouching of the
small bowel. About 1 in every 50 people has a
Meckel diverticulum. Meckel diverticula are usually
located about 2 feet before the junction of the small
bowel and the colon (the large intestine) in the
lower-right abdomen. Meckel diverticula can
become inflamed, ulcerate, and perforate (break
open or rupture), which can cause obstruction of
the small bowel. Generally Meckel diverticula that
are inflamed or perforated are removed via surgery.
dizziness
Painless head discomfort with many
possible causes, including disturbances of vision,
the brain, the balance (vestibular) system of the
inner ear, or the gastrointestinal system. Dizziness is
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dizziness
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a medically indistinct term. Laypersons use it to
describe a variety of conditions, ranging from light-
headedness or unsteadiness to vertigo. See also
lightheadedness; unsteadiness; vertigo.
dizziness, anxiety as a cause of
One cause of
dizziness is overbreathing (hyperventilation) due to
anxiety. Relief can be had by breathing in and out of
a paper bag to increase the level of carbon dioxide
in the blood. In persistent cases, as in repeated
panic attacks, antianxiety medication can be helpful.
dizziness, presyncopal
Dizziness before faint-
ing. Some symptoms of dizziness, such as “woozi-
ness,” feeling as though one is about to black out,
and tunnel vision may be presyncopal and are due
to insufficient blood flow to the brain. These symp-
toms are typically worse when standing, improve
with lying down, and may be experienced by healthy
individuals who rise quickly from a seated or prone
position and have a few seconds of disorientation.
See also 
syncope.