- Immune System
- Impetigo : Pictures
- Infectious Diseases
- Infectious Mononucleosis
- Inflammatory Bowel Disease see Crohn's Disease
- Inflammatory Breast Cancer
- Influenza
- Informatics see Medical Informatics & Computers
- Injuries & Wounds
- Insect Bites
- Insomnia see Sleep Disorders
- Interstitial Cystitis
- Intervertebral Disk Displacement see Herniated Disc
- Intestinal Cancer see Colon Cancer
- Intestinal Diseases see Digestive System
- Irritable Bowel Syndrome
- Irritant Contact Dermatitis