- Gallbladder : Gallstones
- Gangrene
- Gastric Bypass
- Gastroesophageal Reflux see Acid Reflux
- Gastrointestinal Diseases see Digestive System
- Gene Therapy
- Genetic Disorders
- Genital Herpes
- Genital Warts
- GERD see Acid Reflux
- Geriatrics
- Germ Warfare see Bioterrorism
- German Measles see Rubella
- Gestational Diabetes
- Giardia
- Gingivitis
- Glandular Fever
- Glaucoma
- Glomerulonephritis
- Goiter
- Gout
- Graves Disease
- Grippe see Influenza
- Gum Disease
- Gynecology