- G6PD deficiency
- Gabapentin
- Galactorrhea
- Galerina poisoning
- Gallbladder, cholesterolosis of
- Gallbladder, porcelain
- Gallbladder carcinoma
- Gallstones
- Gamete intrafallopian transfer (GIFT)
- Gamma hydroxybutyrate overdose
- Gamma-rays, radiation reactions from
- Ganciclovir 4.5 mg surgical insert
- Gangrene
- Gas gangrene
- Gastric adenocarcinoma (gastroadenocarcinoma)
- Gastric artery aneurysms
- Gastric aspiration, acute
- Gastric aspiration, chronic
- Gastric cancer
- Gastric carcinoids
- Gastric contents, aspiration of
- Gastric lymphoma
- Gastric tumor
- Gastric ulcer
- Gastric ulcer, complications of
- Gastrinomas
- Gastrinomas, in Zollinger-Ellison syndrome
- Gastritis
- Gastroenteritis
- Gastroepiploic artery aneurysms
- Gastroesophageal reflux disease (GERD)
- Gastrointestinal bleeding
- Gastrointestinal HCO3- loss
- Gastroparesis
- Gaucher's disease
- G-CSF
- Gemcitabine
- Gemfibrozil
- Gemfinitib
- Gemtuzumab ozogamicin
- Gender identity disorders
- Generalized anxiety disorder (GAD)
- Genital herpes
- Genital infections
- Genital prolapse
- Genital pruritus
- Genital ulcer
- Genital warts
- Genital warts, vaginitis
- Gentamicin sulfate 0.3% ointment
- Gentamicin sulfate 0.3% solution
- Geodon
- GERD
- Geriatric screening
- Gestational diabetes mellitus
- Gestational diabetes mellitus, screening and diagnostic criteria for
- Gestational trophoblastic disease, paraneoplastic syndromes with
- GHB overdose
- Giant cell arteritis
- Giant cell thyroiditis
- Giardia (giardiasis)
- Giardia lamblia
- GI bleeding, acute lower
- GI bleeding, acute upper
- GI bleeding, occult
- GIFT
- Gigantism
- Gilbert's syndrome
- Gingival hyperplasia
- Gingivitis, necrotizing ulcerative
- Glanders, drugs for
- Glanzmann's thrombasthenia
- Glaucoma, acute angle-closure
- Glaucoma, chronic open-angle
- Gleevec
- Glimeperide
- Glioblastoma multiforme
- Glioma, brain stem
- Glipizide
- Glomerular sclerosis, focal segmental
- Glomerulonephritis
- Glomerulonephropathies
- Glomerulopathies, in renal failure
- Glossitis
- Glossodynia
- Glossophyarngeal neuralgia
- Glucagonomas
- Glucocorticoids, for allergies, effectiveness of
- Glucophage
- Glucophage XR
- Glucose, decreased serum
- Glucose-6-phosphate dehydrogenase deficiency
- Glucose tolerance test, oral, Diabetes Expert Committee evaluation criteria for
- Glucosuria
- Glucotrol
- Glucotrol XL
- Glucovance
- Gluten enteropathy
- Glyburide
- Glyburide/metformin
- Glynase
- Glyset
- GM-CSF
- Gnathostoma spinigerum
- Gnathostomiasis
- GnRH analogs
- Goiter
- Gold salts, in breast-feeding women
- Gonadal dysgenesis
- Gonadotropin, deficiency of
- Gonadotropin, excess, cancers with
- Gonococcal arthritis
- Gonococcal infections
- Gonococcal infections, drugs for
- Gonorrhea
- Goodpasture's syndrome, pulmonary
- Goodpasture's syndrome, renal
- Goserelin acetate
- Gouty arthritis
- Gouty arthritis, diagnostic value of joint pattern in
- Gram-negative cocci, drugs for
- Gram-negative folliculitis
- Gram-negative rods, drugs for
- Gram-positive cocci, drugs for
- Gram-positive rods, drugs for
- Grand mal seizure
- Granisetron
- Granulocytopenia
- Granuloma, swimming pool
- Granuloma inguinale
- Granulomatosis, Wegener's
- Granulomatous meningitis, cerebrospinal fluid in
- Granulomatous thyroiditis
- Granulosa cell tumor
- Graves' disease
- Gray (Gy)
- Group A streptococcal infections
- Growth hormone, increased, in acromegaly and gigantism
- Guanabenz
- Guanadrel
- Guanfacine
- Guillian-Barre Syndrome
- Guinea worm infection
- Gynecomastia
- Gyromitra poisoning