This is a list of diseases starting with the letter "G".

Ga

Gal–Gap

• Galactorrhea
• Galactocoele
• Galactokinase deficiency
• Galactorrhea hyperprolactinemia
• Galactosamine-6-sulfatase deficiency
• Galactose-1-phosphate uridylyltransferase deficiency
• Galactosemia
• Galloway Mowat syndrome
• Gamborg–Nielsen syndrome
• Game–Friedman–Paradice syndrome
• Gamma aminobutyric acid transaminase deficiency
• Gamma-cystathionase deficiency
• Gamma-sarcoglycanopathy
• Gamstorp episodic adynamy
• Ganglioglioma
• Gangliosidosis
  • Gangliosidosis (Type2)(GM2)
  • Gangliosidosis GM1 type 3
  • Gangliosidosis type1
• Ganser syndrome
• GAPO syndrome
• Garchichiliosis

Gar–Gau

• Garcia–Torres–Guarner syndrome
• Gardner–Morrisson–Abbot syndrome
• Gardner–Silengo–Wachtel syndrome
• Gardner–Diamond syndrome
• Gardner's syndrome
• Garret–Tripp syndrome
• Gas/bloat syndrome
• Gastric dumping syndrome
• Gastric lymphoma
• Gastritis, familial giant hypertrophic
• Gastrocutaneous syndrome
• Gastroenteritis, eosinophilic
• Gastro-enteropancreatic neuroendocrine tumor
• Gastroenteritis
• Gastroesophageal reflux
• Gastrointestinal autonomic nerve tumor
• Gastrointestinal neoplasm
• Gaucher disease

• Gaucher disease type 1
• Gaucher disease type 2
• Gaucher disease type 3
• Gaucher ichthyosis restrictive dermopathy
• Gaucher-like disease

Gay

• Gay–Feinmesser–Cohen syndrome

Ge

Gee–Gem

• Geen Sandford Davison syndrome
• Gelatinous ascites
• Geleophysic dwarfism
• Gelineau disease
• Geliphobia
• Gemignani syndrome
• Gemss syndrome

Gen–Ger

• Gender dysphoria
• Genée-Wiedemann syndrome
• Generalized anxiety disorder (GAD)
• Generalized malformations in neuronal migration
• Generalized resistance to thyroid hormone
• Generalized seizure
• Generalized torsion dystonia
• Genes syndrome
• Genetic diseases, inborn
• Genetic reflex epilepsy
• Genetic susceptibility to infections caused by BCG
• Genital anomaly cardiomyopathy
• Genital dwarfism, Turner type
• Genital dwarfism
• Genital retraction syndrome (also known as koro)
• Genito palatocardiac syndrome
• Genu valgum, st. Helena familial
• Genu varum
• Genuphobia
• Geographic tongue
• German syndrome
• Germinal cell aplasia
• Gerodermia osteodysplastica
• Gershinibaruch–Leibo syndrome
• Gerstmann syndrome

Ges

• Gestational diabetes mellitus
• Gestational pemphigoid
• Gestational trophoblastic disease

Gh

• Ghosal syndrome
• Ghose–Sachdev–Kumar syndrome

Gi

• Gianotti-Crosti syndrome
• Giant axonal neuropathy
• Giant cell arteritis
• Giant cell myocarditis
• Giant congenital nevi
• Giant ganglionic hyperplasia
• Giant hypertrophic gastritis
• Giant mammary hamartoma
• Giant papillary conjunctivitis
• Giant pigmented hairy nevus
• Giant platelet syndrome
• Giardiasis
• Gibson's Syndrome
• Giedion syndrome
• Gigantism advanced bone age hoarse cry
• Gigantism partial, nevi, hemihypertrophy, macrocephaly
• Gigantism
• Gilbert's syndrome
• Gilles de la Tourette's syndrome
• Gingival fibromatosis dominant
• Gingival fibromatosis facial dysmorphism
• Gingival fibrosis
• Gingivitis
• Gyrate atrophy of the choroid and retina
• Gitelman syndrome
• Gittings syndrome

Gl

Gla–Gli

• Glanzmann thrombasthenia
• Glass–Chapman–Hockley syndrome
• Glaucoma
  • Glaucoma ecopia microspherophakia stiff joints short stature
  • Glaucoma iridogoniodysgenesia
  • Glaucoma sleep apnea
  • Glaucoma type 1C
  • Glaucoma, congenital
  • Glaucoma, hereditary adult type 1A
  • Glaucoma, hereditary juvenile type 1B
  • Glaucoma, hereditary
  • Glaucoma, primary infantile type 3A
  • Glaucoma, primary infantile type 3B
• Glioblastoma
• Glioma
• Gliosarcoma

Glo

• Globel disaccharide intolerance
• Glomerulonephritis sparse hair telangiectases
• Glomerulonephritis
• Glomerulosclerosis
• Gloomy face syndrome
• Glossodynia
• Glossopalatine ankylosis micrognathia ear anomalies
• Glossopharyngeal neuralgia
• Glossophobia

Glu

• Glucagonoma
• Glucocorticoid deficiency, familial
• Glucocorticoid resistance
• Glucocorticoid sensitive hypertension
• Glucose 6 phosphate dehydrogenase deficiency
• Glucose-6-phosphate translocase deficiency
• Glucose-galactose malabsorption
• Glucosephosphate isomerase deficiency
• Glucosidase acid-1,4-alpha deficiency
• Glut2 deficiency
• Glutamate decarboxylase deficiency
• Glutamate-aspartate transport defect
• Glutaricaciduria I
• Glutaricaciduria II
• Glutaryl-CoA dehydrogenase deficiency
• Glutathione synthetase deficiency

Gly

• Glyceraldehyde-3-phosphate dehydrogenase deficiency
• Glycine synthase deficiency
• Glycogen storage disease

• Glycogen storage disease type 1B
• Glycogen storage disease type 1C
• Glycogen storage disease type 1D
• Glycogen storage disease type 6, due to phosphorylation
• Glycogen storage disease type 7
• Glycogen storage disease type 9
• Glycogen storage disease type II
• Glycogen storage disease type V
• Glycogen storage disease type VI
• Glycogen storage disease type VII
• Glycogen storage disease type VIII

• Glycogenosis

• Glycogenosis type II
• Glycogenosis type III
• Glycogenosis type IV
• Glycogenosis type V
• Glycogenosis type VI
• Glycogenosis type VII
• Glycogenosis type VIII
• Glycogenosis, type 0

• Glycosuria

Gm

• GM2 gangliosidosis, 0 variant
• GM2-gangliosidosis, B, B1, AB variant
• GMS syndrome

Go

Goi–Gon

• Goitre
• Goldberg–Bull syndrome
• Goldberg syndrome
• Goldblatt–Wallis syndrome
• Goldblatt–Wallis–Zieff syndrome
• Goldblatt–Viljoen syndrome
• Goldenhar syndrome
• Goldskag–Cooks–Hertz syndrome
• Goldstein–Hutt syndrome
• Gollop–Coates syndrome
• Gollop syndrome
• Goltz syndrome
• Gombo syndrome
• Gomez and López-Hernández syndrome
• Gonadal dysgenesis

• Gonadal dysgenesis mixed
• Gonadal dysgenesis Turner type
• Gonadal dysgenesis XY type associated anomalies
• Gonadal dysgenesis, XX type
• Gonadal dysgenesis, XY female type
• Goniodysgenesis mental retardation short stature

• Gonococcal conjunctivitis
• Gonzales Del Angel syndrome

Goo–Gou

• Goodman camptodactyly
• Goodpasture pneumorenal syndrome
• Goodpasture's syndrome
• Gordon hyperkaliemia-hypertension syndrome
• Gordon syndrome
• Gorham syndrome
• Gorham's disease
• Gorham–Stout disease
• Gorlin–Bushkell–Jensen syndrome
• Gorlin–Chaudhry–Moss syndrome
• Gottron's syndrome
• Gougerot–Blum syndrome
• Gougerot–Sjogren syndrome
• Gout
• Gouty nephropathy, familial

Gr

Gra–Gri

• Graft versus host disease
• Graham–Boyle–Troxell syndrome
• Grand–Kaine–Fulling syndrome
• Grant syndrome
• Granulocytopenia
• Granuloma annulare
• Granulomas, congenital cerebral
• Granulomatosis, lymphomatoid
• Granulomatous allergic angiitis
• Granulomatous hypophysitis
• Granulomatous rosacea
• Graphite pneumoconiosis
• Graves' disease
• Gray platelet syndrome
• Great vessels transposition
• Greenberg dysplasia
• Greig cephalopolysyndactyly syndrome GCPS
• Griscelli disease
• Grix–Blankenship–Peterson syndrome

Gro–Gru

• Groll–Hirschowitz syndrome
• Grosse syndrome
• Grover's disease
• Growth deficiency brachydactyly unusual facies
• Growth delay, constitutional
• Growth hormone deficiency
• Growth mental deficiency syndrome of Myhre
• Growth retardation alopecia pseudoanodontia optic
• Growth retardation hydrocephaly lung hypoplasia
• Growth retardation mental retardation phalangeal hypoplasia
• Grubben–Decock–Borghgraef syndrome

Gt–Gy

• GTP cyclohydrolase deficiency
• Guanidinoacetate methyltransferase deficiency
• Guérin–Stern syndrome
• Guibaud–Vainsel syndrome
• Guillain–Barré syndrome
• Guizar–Vasquez–Luengas syndrome
• Guizar–Vasquez–Sanchez–Manzano syndrome
• Gunal–Seber–Basaran syndrome
• Gupta–Patton syndrome
• Gurrieri–Sammito–Bellussi syndrome
• Gusher syndrome
• Gymnophobia
• Gynecomastia
• Gyrate atrophy of the retina
• Gyrate atrophy