Webster's New World Medical Dictionary

209
hypomagnesemia
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calcium (hypocalcemia) and low potassium
(hypokalemia). It causes increased irritability of the
nervous system with tetany (spasms of the hands
and feet, muscular twitching and cramps, spasm of
the larynx, and overly active reflexes). 
hypomania
A condition similar to mania but less
severe. The symptoms include elevated mood,
increased activity, decreased need for sleep,
grandiosity, racing thoughts, and the like. However,
hypomanic episodes differ in that they do not cause
significant distress or impair one’s work, family, or
social life to the extent that manic episodes do.
Hypomania is one component of cyclothymic disor-
der, a condition similar to but less severe than bipo-
lar disorder, in which episodes of hypomania
alternate with episodes of depression known as dys-
thymia. See also 
cyclothymia; mania.
hyponatremia
Low sodium in the blood.
Hyponatremia can be caused by many conditions
and when severe can lead to confusion and seizures.
hypophosphatemia
A lower-than-normal level
of phosphate in the blood. Hypophosphatemia can
be associated with a number of conditions including
bone diseases and hormone conditions. Symptoms
occur only when hypophosphatemia is very severe
and include muscle weakness that may progress to
coma and death.
hypopigmentation
Lack of color in the skin or
eyes. Hypopigmentation is characteristic of the
various forms of albinism and of several genetic dis-
eases. See 
albinism; Hermansky-Pudlak syndrome.
hypoplasia
Underdevelopment or incomplete
development of a tissue or an organ. For example,
hypoplasia of the enamel of the teeth indicates that
the enamel coating is thinner than normal or miss-
ing in some but not all areas. Hypoplasia is less
drastic than aplasia, where there is no development
of a tissue or an organ at all.