This list of rare diseases was originally taken from the NIH public domain resource at http://ord.aspensys.com/asp/diseases/diseases.asp .

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

  • Rabies
  • Rabson-Mendenhall syndrome
  • Radial defect Robin sequence
  • Radial hypoplasia, triphalangeal thumbs and hypospadias
  • Radial ray agenesis
  • Radial ray hypoplasia choanal atresia
  • Radiation induced angiosarcoma of the breast
  • Radiation induced meningioma
  • Radiation leukemia
  • Radiation related neoplasm /cancer
  • Radiation syndromes
  • Radiation-Induced Brachial Plexopathy
  • Radiculomegaly of canine teeth congenital cataract
  • Radio digito facial dysplasia
  • Radio renal syndrome
  • Radiophobia
  • Radioulnar synostosis mental retardation hypotonia
  • Radioulnar synostosis retinal pigment abnormalities
  • Radio-ulnar synostosis type 1
  • Radio-ulnar synostosis type 2
  • Radius absent anogenital anomalies
  • Raine syndrome
  • Rambam Hasharon syndrome
  • Rambaud Galian syndrome
  • Ramer Ladda syndrome
  • Ramon Syndrome
  • Ramos Arroyo Clark syndrome
  • Ramsay Hunt paralysis syndrome
  • Rapadilino syndrome
  • Rapp-Hodgkin syndrome
  • Rasmussen encephalitis
  • Rasmussen Johnsen Thomsen syndrome
  • Rasmussen subacute encephalitis
  • Ray Peterson Scott syndrome
  • Raynaud's disease/phenomenon
  • Rayner Lampert Rennert syndrome
  • Reactive airway disease
  • Reactive arthritis
  • Reactive attachment disorder of early childhood
  • Reactive attachment disorder of infancy
  • Reactive hypoglycemia
  • Reardon Hall Slaney syndrome
  • Reardon Wilson Cavanagh syndrome
  • Rectal neoplasm
  • Rectophobia
  • Rectosigmoid neoplasm
  • Recurrent laryngeal papillomas
  • Recurrent peripheral facial palsy
  • Recurrent respiratory papillomatosis
  • Reductional transverse limb defects
  • Reflex sympathetic dystrophy syndrome
  • Reflux esophagitis
  • Refractory anemia
  • Refsum disease, infantile form
  • Refsum Syndrome
  • Reginato Shiapachasse syndrome
  • Regional enteritis
  • Reifenstein Syndrome
  • Reinhardt Pfeiffer syndrome
  • Reiter's Syndrome
  • Renal adysplasia dominant type
  • Renal agenesis meningomyelocele mullerian defect
  • Renal agenesis, bilateral
  • Renal agenesis
  • Renal artery stenosis
  • Renal calculi
  • Renal caliceal diverticuli deafness
  • Renal cancer
  • Renal carcinoma, familial
  • Renal cell carcinoma 4
  • Renal cell carcinoma
  • Renal dysplasia diffuse autosomal recessive
  • Renal dysplasia diffuse cystic
  • Renal dysplasia limb defects
  • Renal dysplasia megalocystis sirenomelia
  • Renal dysplasia mesomelia radiohumeral fusion
  • Renal failure
  • Renal genital middle ear anomalies
  • Renal glycosuria
  • Renal hepatic pancreatic dysplasia Dandy Walker cyst
  • Renal hypertension
  • Renal osteodystrophy
  • Renal rickets
  • Renal tubular acidosis progressive nerve deafness
  • Renal tubular acidosis, distal, autosomal dominant
  • Renal tubular acidosis, distal, autosomal recessive
  • Renal tubular acidosis, distal, type 3
  • Renal tubular acidosis, distal, type 4
  • Renal tubular acidosis, distal
  • Renal tubular acidosis
  • Renal tubular transport disorders inborn
  • Renier Gabreels Jasper syndrome
  • Renoanogenital syndrome
  • Renoprival hypertension
  • Resistance to LH (luteinizing hormone)
  • Resistance to thyroid stimulating hormone
  • Respiratory acidosis
  • Respiratory chain deficiency malformations
  • Respiratory distress syndrome, Adult
  • Respiratory distress syndrome, infant
  • Restless legs syndrome
  • Reticuloendotheliosis
  • Retina disorder
  • Retinal degeneration
  • Retinal dysplasia X linked
  • Retinal telangiectasia hypogammaglobulinemia
  • Retinis pigmentosa deafness hypogenitalism
  • Retinitis pigmentosa mental retardation deafness
  • Retinitis pigmentosa
  • Retinitis pigmentosa-deafness
  • Retinoblastoma
  • Retinohepatoendocrinologic syndrome
  • Retinopathy anemia CNS anomalies
  • Retinopathy aplastic anemia neurological abnormalities
  • Retinopathy pigmentary mental retardation
  • Retinopathy, arteriosclerotic
  • Retinopathy, diabetic
  • Retinoschisis, juvenile
  • Retinoschisis, X-linked
  • Retinoschisis
  • Retrolental fibroplasia
  • Retroperitoneal fibrosis
  • Retroperitoneal liposarcoma
  • Rett like syndrome
  • Rett Syndrome
  • Revesz Debuse syndrome
  • Reye syndrome
  • Reynolds Neri Hermann syndrome
  • Reynolds syndrome
  • Rh disease
  • Rhabditida Infections
  • Rhabdoid tumor
  • Rhabdomyomatous dysplasia cardiopathy genital anomalies
  • Rhabdomyosarcoma 1
  • Rhabdomyosarcoma 2
  • Rhabdomyosarcoma, alveolar
  • Rhabdomyosarcoma, embryonal
  • Rhabdomyosarcoma
  • Rheumatic Fever
  • Rheumatism
  • Rheumatoid arthritis
  • Rheumatoid vasculitis
  • Rhizomelic dysplasia type Patterson Lowry
  • Rhizomelic pseudopolyarthritis
  • Rhizomelic syndrome
  • Rhumatoid purpura
  • Rhypophobia
  • Rhytiphobia
  • Ribbing disease
  • Richards-Rundle syndrome
  • Richieri Costa Da Silva syndrome
  • Richieri Costa Gorlin syndrome
  • Richieri Costa Guion Almeida acrofacial dysostosis
  • Richieri Costa Guion Almeida Cohen syndrome
  • Richieri Costa Guion Almeida dwarfism
  • Richieri Costa Guion Almeida Rodini syndrome
  • Richieri Costa Montagnoli syndrome
  • Richieri Costa Orquizas syndrome
  • Richieri Costa Silveira Pereira syndrome
  • Richieri-Costa Colletto Otto syndrome
  • Richter syndrome
  • Rickets
  • Rickettsial disease
  • Rickettsiosis
  • Rieger syndrome
  • Right atrium familial dilatation
  • Right ventricle hypoplasia
  • Rigid mask like face deafness polydactyly
  • Rigid spine syndrome
  • Riley-Day syndrome
  • Ringed hair disease
  • Rivera Perez Salas syndrome
  • Roberts Syndrome
  • Robin sequence and oligodactyly
  • Robinow Sorauf syndrome
  • Robinow syndrome
  • Robinson Miller Bensimon syndrome
  • Roch-Leri mesosomatous lipomatosis
  • Rocky Mountain spotted fever
  • Rod myopathy
  • Rodini Richieri Costa syndrome
  • Rokitansky Kuster Hauser syndrome
  • Rokitansky sequence
  • Romano-Ward syndrome
  • Romberg hemi-facial atrophy
  • Rombo syndrome
  • Rommen Mueller Sybert syndrome
  • Rosai-Dorfman disease
  • Rosenberg Chutorian syndrome
  • Rosenberg Lohr syndrome
  • Roseola infantum
  • Rotor syndrome
  • Roussy Levy hereditary areflexic dystasia
  • Rowley-Rosenberg syndrome
  • Roy Maroteaux Kremp syndrome
  • Rozin Hertz Goodman syndrome
  • Rubella virus antenatal infection
  • Rubella, congenital
  • Rubella
  • Rubinstein Taybi like syndrome
  • Rubinstein-Taybi syndrome
  • Rudd Klimek syndrome
  • Rudiger syndrome
  • Rumination disorder
  • Rupophobia
  • Rutledge Friedman Harrod syndrome
  • Ruvalcaba Churesigaew Myhre syndrome
  • Ruvalcaba syndrome
  • Ruvalcaba-Myhre syndrome
  • Ruvalcaba-Myhre-Smith syndrome (BRR)
  • Ruzicka Goerz Anton syndrome