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galactosemia — a condition where the body is not able to process galactose (a sugar), which makes up half of the sugar (called lactose) found in milk. When galactose levels become high, body organs and the central nervous system can be damaged. In newborns, the condition is found when first breastfeeding and can cause jaundice and other problems.

gastrointestinal — a term that refers to the stomach and the intestines or bowels.

GER (gastroesophageal reflux) — also called acid reflux, a condition where the contents of the stomach regurgitates (or backs up) into the esophagus (food pipe), causing discomfort.

glandular tissue — body tissue that produces and releases one or more substances for use in the body. Some glands produce fluids that affect tissues or organs. Others produce hormones or participate in blood production. In the breast, glandular tissue is involved in the production of milk.

goiter — enlargement of the thyroid gland that is not associated with inflammation or cancer.

gonorrhea — a sexually transmitted disease that often has no symptoms. However, some women have pain or burning when urinating; yellowish and sometimes bloody vaginal discharge; bleeding between menstrual periods; heavy bleeding with periods; or pain when having sex. Untreated gonorrhea can cause serious and permanent health problems like pelvic inflammatory disease (PID).