R
- Rabbit fever
- Rabies
- Radial head subluxation
- Radiation exposure
- Rapid ejaculation
- Raynaud's phenomenon
- Reactive arthritis
- Rectal cancer
- Rectal prolapse
- Rectovaginal fistula
- Recurrent compartment syndrome
- Reduced iron in blood
- Reflux nephropathy - child
- Reflux-adolescent
- Reflux-child
- Reflux-child with disabilities
- Reflux-infant
- Reflux esophagitis-adolescent
- Reflux esophagitis-child
- Reflux esophagitis-child with disabilities
- Reflux esophagitis-infant
- Reflux nephropathy - adult
- Reflex sympathetic dystrophy
- Reflux, heartburn-overview
- Regional enteritis
- Reiter's syndrome
- Renal artery stenosis
- Renal calculi - child
- Renal colic - child
- Renal colic—adult
- Renal failure
- Renal insufficiency
- Renal lithiasis - child
- Renal lithiasis—adult
- Renovascular hypertension
- Respiratory distress syndrome in newborns
- Respiratory syncytial virus
- Restless leg syndrome
- Retained fetal lung fluid
- Retinal detachment
- Retinitis pigmentosa
- Retinoblastoma
- Retinopathy of prematurity
- Retrolental Fibroplasia
- Retrorectal tumor
- Rett's disorder
- Rett syndrome
- Reye's syndrome
- Rh incompatibility and isoimmunization
- Rhabdomyolysis
- Rhabdomyosarcoma - child
- RhD incompatibility
- Rheumatic fever
- Rheumatoid arthritis
- Rib fracture
- Rice-field fever
- Rickets
- Right hemisphere stroke
- Right-side stroke
- Ringing in the ears
- Ringworm
- Ringworm of the scalp
- RLF
- Rocky mountain spotted fever
- Rosacea
- ROP
- Roseola
- Rotator cuff injury
- Rotator cuff tendinosis
- Rotator cuff tendonitis
- Rotavirus
- Roundback of the Spine
- Roundworm
- RSV
- Rubella
- Runner's knee
- Rupture, Achilles Tendon
- Ruptured disk
- Ruptured eardrum
- Ruysch's disease