- Rabies@ (15)
- Raine Syndrome@ (5)
- Rash@ (10)
- Rat Bite Fever@ (5)
- Raynaud's Phenomenon@ (5)
- Reaven's Syndrome@ (3)
- Reflex Sympathetic Dystrophy@ (23)
- Reflux Disease@ (18)
- Refsum's Disease@ (3)
- Reiter's Syndrome@ (8)
- Relapsing Fever@ (5)
- Renal Agenesis@ (9)
- Repetitive Strain Injuries@ (13)
- Respiratory Distress Syndrome@ (7)
- Respiratory Syncytial Virus@ (8)
- Restless Leg Syndrome@ (12)
- Retinal Detachment@ (6)
- Retinal Migraine@ (3)
- Retinitis Pigmentosa@ (12)
- Retinoblastoma@ (21)
- Retinopathy of Prematurity@ (4)
- Rett Syndrome@ (16)
- Reye's Syndrome@ (4)
- Rheumatic Fever@ (14)
- Rheumatoid Arthritis@ (23)
- Rhinitis@ (16)
- Rib-Gap Syndrome@ (2)
- Rickets@ (9)
- Rickettsialpox@ (3)
- Riley-Day Syndrome@ (5)
- Ringworm@ (25)
- River Blindness@ (16)
- Robinow Syndrome@ (3)
- Rocky Mountain Spotted Fever@ (4)
- Romberg's Syndrome@ (2)
- Rosacea@ (19)
- Rotator Cuff Injury@ (5)
- Rotavirus@ (1)
- Roundworms@ (44)
- Rubella@ (12)
- Rubeola@ (13)
- Rubinstein-Taybi Syndrome@ (7)
- Runner's Knee@ (3)
- Ruptured Disk@ (10)
- Russell Silver Syndrome@ (5)
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