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hypoglycemia hy·po·gly·ce·mi·a (hī'pō-glī-sē'mē-ə)
An abnormally low concentration of glucose in the blood.
An abnormally low level of sugar in the blood, most commonly caused by excessive doses of insulin in people with diabetes or by excessive ingestion of alcohol or certain other drugs. It can cause weakness, dizziness, disorientation, and, if prolonged, permanent brain damage.