- Rabbit Fever see Tularemia
- Radiology
- Ramsay Hunt Syndrome
- Rash see Skin Diseases ; Childrens Skin Rashes
- Recklinghausen's disease see Neurofibromatosis
- Rectal Cancer see Colon Cancer
- Reiters Syndrome
- Remicade
- Renal Disease see Kidney Disease
- Respiratory System
- Rheumatoid Arthritis
- Ricin
- Ringworm : Pictures
- Ritalin
- River Blindness
- Rocky Mountain Spotted Fever
- Rosacea
- Roseola
- Roundworms
- Rubella
- Rubeola see Measles
- Running Injuries see Sports Injuries