Galactorrhea
Gallbladder cancer
Gallstones
Ganglion cysts
Gangrene
Gas and gas pains
Gastritis
Gastroesophageal reflux disease (GERD)
Gastrointestinal anthrax
Gastroparesis
Gaucher's disease
Generalized anxiety disorder
Genital herpes
Genital lichen planus
Genital warts
Geographic tongue
Giant cell arteritis
Giardia infection (giardiasis)
Gilbert's syndrome
Gingivitis
Glandular tularemia
Glomerulonephritis
Goiter
Golfer's elbow
Gonorrhea
Gout
Gram negative folliculitis
Granuloma annulare
Graves disease
Greenstick fractures
Group B strep disease
Growing pains
Growth plate fractures
Guillain Barre syndrome
Guttate psoriasis
Gynecomastia (enlarged breasts in men)