Rabies Radiation enteritis Raynauds phenomenon Reactive arthritis Reactive attachment disorder of infancy or early childhood Rectal prolapse Red eye Relapsing fever Renal and urologic disorders Respiratory syncytial virus (RSV) Retained fetal lung fluid Retinal artery occlusion Retinal detachment Retinitis pigmentosa Retinopathy of prematurity Retroperitoneal inflammation Retropharyngeal abscess Retrosternal thyroid Rett syndrome Reye syndrome Rhabdomyolysis Rheumatoid-collagen disease Rickettsial pox Ritter disease Rocky Mountain spotted fever Roseola Rubinstein syndrome Rumination disorder Russell-Silver syndrome