Diagnosaurus
- Radial nerve palsy
- Rash, annular
- Rash, desquamative
- Rash, eczematous
- Rash, facial
- Rash, figurate (shaped)
- Rash, general DDx
- Rash, groin
- Rash, intertriginous
- Rash, malar
- Rash, morbilliform
- Rash, palms and soles
- Rash, scaly
- Rash and fever
- Raynaud's syndrome
- Rectal pain
- Recurrent respiratory tract infection
- Red eye
- Red eye, circumcorneal
- Reflexes, delayed relaxation
- Reflux, gastroesophageal
- Relapsing or recurrent fever
- Relative bradycardia
- Renal cysts
- Renal tubular acidosis
- Renal tumor
- Respiration, Cheyne-Stokes
- Respiratory acidosis
- Respiratory alkalosis
- Respiratory failure, acute
- Respiratory tract infections, recurrent
- Restrictive disease on PFTs
- Rhabdomyolysis
- Rhinitis
- Right atrial enlargement, EKG
- Right axis deviation, EKG
- Right to left shunt
- Rigidity