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All Communities

  • Sacral Agenesis

    4 members

    Sacral Agenesis is a rare spinal deformity affecting the sacrum.

  • Sacrococcygeal Teratoma

    1 members

    Sacrococcygeal Teratoma tumor located at the base of the tailbone.

  • Saethre-Chotzen Syndrome

    1 members

  • Salivary Gland Cancer


    Salivary Gland Cancer is a rare form of cancer in the salivary glands.

  • Sandhoff Disease


    Sandhoff Disease is a rare genetic lipid storage disorder.

  • Sanfilippo Syndrome

    5 members

    Sanfilippo Syndrome is a rare autosomal recessive metabolic disorder characterized by severe neurological symptoms.

  • SAPHO Syndrome

    19 members

    SAPHO Syndrome is a disorder characterized by synovitis, acne, pustulosis, hyperostosis, and osteitis.

  • Sarcoidosis

    46 members

    Sarcoidosis is a rare immune system disorder characterized by non-caseating granulomas which most often appear in the lungs or the lymph nodes.

  • Sarcosinemia


    Sarcosinemia is a rare disorder characterized by increased sarcosine in the blood plasma and urine.

  • Schamberg Disease

    2 members

    Schamberg Disease is a chronic discoloration of the skin, most commonly affecting the legs.

  • Schinzel-Giedion Syndrome

    2 members

    Schinzel-Giedion Syndrome is a rare congenital neurodegenerative disorder.

  • Schizencephaly

    7 members

    Schizencephaly is a rare cortical malformation of the brain.

  • Schnitzler Syndrome

    3 members

    Schnitzler Syndrome is a rare disease characterised by chronic hives.

  • Schwannomatosis

    10 members

    Schwannomatosis is a rare disorder affecting the peripheral nervous system where benign tumors called schwannomas grow on perippheral nerves.

  • Scleroderma

    29 members

    Sclerodrema, also known as systemic sclerosis is a chronic disease in which there are excessive deposits of collagen in various organs.

  • Scleromyxedema

    24 members

    Scleromyxedema is a condition of mucinous deposition in the skin associated with monoclonal gammopathy characterized by a flesh-colored, papular skin eruption. The average age onset is 55 years and...

  • Sclerosing Mesenteritis

    5 members

    Sclerosing Mesenteritis is a rare disorder caused when the small bowel's membranes become inflamed and fibrous resulting in an abdominal mass.

  • Secondary Adrenal Insufficiency

    1 members

    Secondary Adrenal Insufficiency is adrenal hypofunction caused by a lack of ACTH.

  • Senior-Loken syndrome

    1 members

  • Sensory Ataxic Neuropathy Dysarthria and Ophthalmoparesis

    1 members

    Sensory Ataxic Neuropathy Dysarthria and Ophthalmoparesis is a rare disorder characterized by progressive ataxia in addition to eye muscle and speech problems.

  • Septo-Optic Dysplasia

    13 members

    Septo-Optic Dysplasia is a malformation resulting in the underdevelopment of the optic nerve, hypopituitarism, and absence of the septum pellucidum.

  • Serpiginous Choroiditis

    5 members

    Serpiginous Choroiditis is a rare inflammatory disease of the retina.

  • Sertoli Cell-only Syndrome

    1 members

    Sertoli cell-only syndrome is a rare disorder characterized by male sterility without sexual abnormality due to the absence of seminiferous tubules in the testes of germinal epithelium, while Serto...

  • Sertoli-Leydig Cell Tumor

    3 members

    Sertoli-Leydig Cell Tumor is a rare ovarian tumor belonging to the group of sex-chord stromal tumors.

  • Sever's Disease

    1 members

    Sever's Disease is a heal disorder caused by overuse and/or repetitive micro trauma of growth plates of the calcaneus in the heel.

  • Severe Combined Immunodeficiency

    3 members

    Severe Combined Immunodeficiency is a rare genetic disorder in which both the B cells and T cells of the immune system are crippled.

  • Severe Congenital Neutropenia

    3 members

    Severe Congenital Neutropenia is a blood disorder characterized by an abnormally low number of a specific type of white blood cells, neutrophils.

  • Shapiro Syndrome

    2 members

    Shapiro Syndrome is a rare disorder characterized by occurances of hypothermia.

  • Sheehan's Syndrome

    6 members

    Sheehan's Syndrome is hypopituitarism during and after childbirth.



  • Short Bowel Syndrome

    6 members

    Short Bowel Syndrome is a disorder causing malabsorption due to the surgical removal of the small intestine or a congenital short bowel.

  • Shprintzen-Goldberg Syndrome

    7 members

    Shprintzen-Goldberg syndrome is a disorder associated with premature closure of sutures of the skull and marfanoid habitus.

  • Shwachman-Diamond Syndrome

    1 members

    Shwachman-Diamond Syndrome is a rare disorder characterized by exocrine pancreatic insufficiency, bone marrow dysfunction, skeletal abnormalities, and short stature.

  • Sialidosis

    4 members

    Sialidosis is a rare disorder resulting from a deficiency of the digestive enzyme sialidase.



  • Sickle Cell Anemia

    5 members

    Sickle cell anemia is a blood disorder characterized by red blood cells that assume a rigid, sickle shape.

  • Sideroblastic Anemia


    Sideroblastic Anemia is a rare disorder caused by the abnormal production of red blood cells in conjunction with sideroblasts.

  • Silver-Russell Dwarfism

    4 members

    Silver-Russell dwarfism is a treatable growth disorder.

  • Simpson-Golabi-Behmel Syndrome

    2 members

    Simpson-Golabi-Behmel Syndrome is a rare genetic disorder with varying symptoms which may include craniofacial and other abnormalities.


  • Sirenomelia

    1 members

    Sirenomelia is a rare congenital disorder in which the legs are fused together, giving the appearance of a mermaid.

  • Situs Inversus

    8 members

    Situs Inversus is a congenital condition in which the major visceral organs are reversed from their normal positions.

  • Sjogren-Larsson Syndrome

    2 members

    Sjogren-Larsson Syndrome is a rare disorder characterized by dry, rough skin and stiff, rigid muscles.

  • Sjögren's Syndrome

    36 members

    Sjogren’s syndrome is characterized by dry eyes, mouth, or other body parts. It is an autoimmune disorder where the immune system mistakenly attacks the affect...

  • Smith-Lemli-Opitz syndrome

    1 members

    Smith-Lemli-Opitz syndrome is a metabolic and developmental disorder that affects many parts of the body.


  • Smith-Magenis Syndrome

    4 members

    Smith-Magenis Syndrome is a rare disorder characterized by abnormal physical, developmental and behavioral features due to microdeletion of chromosome 17.

  • Sneddon's Syndrome

    28 members

    Sneddon's Syndrome is a rare disorder of the arteries leading to purplish mottled skin (especially in the cold) and severe but transient neurological symptoms. It is generally understood to ...

  • Sotos Syndrome

    3 members

    Sotos Syndrome is a rare genetic disorder characterized by excessive physical growth during the first 2 to 3 years of life.

  • Spastic Paraplegia

    7 members

    Spastic Paraplegia is a group of genetic disorders characterized by progressive spasticity in the lower limbs.

  • Spinal Cord Infarction

    3 members

    Spinal Cord Infarction is injury to the spinal cord due to oxygen deprivation.

  • Spinal Muscular Atrophy

    8 members

    Spinal Muscular Atrophy is a group of rare muscle disorders in which the muscles become progressively weakdue to damage to motor neurons.

  • Spinocerebellar Ataxia

    10 members

    Spinocerebellar Ataxia is a progressive group of rare disorders affecting muscle movements.

  • Spinocerebellar Ataxia Type 6

    1 members

    Spinocerebellar Ataxia Type 6 is a rare disorder characterized by dysarthria, oculomotor disorders, incontinence, peripheral neuropathy, and ataxia of gait, stance and the limbs due to cerebellar d...

  • Split-Hand/Split-Foot Malformation

    4 members

    Split-Hand/Split-Foot Malformation is a rare autosomal dominant disorder characterized by congenital deformity of the hand where the middle digit is missing.

  • Spondylocostal dysostosis associated with BMPER2

    1 members

    Rare disorder with axial skeleton failure to form.  

  • Spondylometaphyseal dysplasia

    2 members

  • Stargardt Disease

    1 members

    Stargardt Disease is a rare inherited genetic disorder causesing progressive vision loss due to macular degeneration.

  • Steroid-Sensitive Nephrotic Syndrome

    2 members

    Steroid-Sensitive Nephrotic Syndrome is a rare kidney disease.

  • Stickler Syndrome

    1 members

    Stickler Syndrome is a group of genetic disorders affecting collagen.

  • Stiff-Man Syndrome

    12 members

    Stiff-Man Syndrome is a rare neurological disorder characterized by progressively severe muscle stiffness, most commonly in the spine and lower extremities.

  • Superficial Siderosis

    3 members

    Superficial Siderosis is a rare disorder causing bleeding into the spinal column that ultimately breaks down in the cerebellum and erodes myelin tissue.

  • Superior Canal Dehiscence Syndrome

    2 members

    Superior Canal Dehiscence Syndrome is a rare medical condition of the inner ear leading to hearing and balance disorders in those affected. Symptoms are caused by a thinning or absence of the part ...

  • Superior Mesenteric Artery Syndrome

    1 members

    Superior Mesenteric Artery Syndrome occurs when the 3rd portion of the duodenum becomes compressed between the Superior Mesenteric Artery and the Abdominal Aorta. This compression causes partial...

  • Supraventricular tachycardia

    2 members

    Supraventricular tachycardia is a heart disorder characterized by an abnormal fast heart rhythm.

  • Susac's syndrome

    10 members

    Susac's syndrome is a rare disease affecting small blood vessels in the body characterized by encephalopathy, branch retinal artery occlusions, and hearing loss.

  • Sydenham's Chorea

    4 members

    Sydenham's Chorea is a disease characterized by rapid, uncoordinated jerking movements affecting primarily the face, feet and hands.

  • Sympathetic Ophthalmia


    Sympathetic Ophthalmia is an inflammation of both eyes following trauma to one eye.

  • Synovial Chondromatosis

    1 members

    Synovial Chondromatosis is a rare benign cancer of the tissue that lines the joints (synovium).

  • Syringomyelia

    132 members

    Syringomyelia (Sear-IN-Joe-My-E-Lee-Uh), or "SM", is a chronic disorder of the spinal cord which consists of the formation of a syrinx (a pocket of cerebral-spinal fluid sometimes referred to as a...

  • Systemic Capillary Leak Syndrome

    352 members

    Systemic Capillary Leak Syndrome (SCLS) is an exceedingly rare, life- and limb-threatening disorder characterized by acute and severe recurrent attacks featuring a rapid fall in blood pressure d...

  • Systemic Lupus Erythematosus

    25 members

    Systemic Lupus Erythematosus is an autoimmune disease in which the immune system cannot tell the difference between unhealthy and healthy cells.


  • Systemic Mastocytosis

    11 members

    Systemic Mastocytosis is a rare disorder involving the internal organs characterized by the presence of too many mast cells.

  • Systemic Onset Juvenile Rheumatoid Arthritis

    1 members