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Disease Profile

Williams syndrome

Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.


US Estimated

Europe Estimated

Age of onset





Autosomal dominant A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease.


Autosomal recessive Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype.


dominant X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.


recessive Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder.


Mitochondrial or multigenic Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.


Multigenic or multifactor Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.


Not applicable


Other names (AKA)

Williams-Beuren syndrome; WBS; WMS;


Blood Diseases; Congenital and Genetic Diseases; Eye diseases;


Williams syndrome is a genetic condition that affects many parts of the body. Signs and symptoms include mild to moderate intellectual disability; unique personality traits; distinctive facial features; and heart and blood vessel problems.[1] Williams syndrome is caused by a person missing more than 25 genes from a specific area of chromosome 7 (a "deletion").[1][2] The loss of these genes contributes to the characteristic features.[1] Although Williams syndrome is an autosomal dominant condition, most cases are not inherited and occur sporadically in people with no family history of Williams syndrome. Treatments are based on each person's signs and symptoms, as there is no cure at this time.[1][3]


The signs and symptoms of Williams syndrome can vary, but generally include:[1][3]

  • mild to moderate intellectual disability;
  • a distinctive facial appearance;
  • and a unique personality that combines over-friendliness and high levels of empathy with anxiety.

People with Williams syndrome typically have difficulty with tasks such as drawing and assembling puzzles. They tend to do well on tasks that involve spoken language, music, and learning by repetition.[1]

Facial features common in young children with Williams syndrome include a broad forehead; a short nose with a broad tip; full cheeks; and a wide mouth with full lips. In older children and adults, the face appears longer and more gaunt. Dental problems are common and may include small, widely spaced teeth and teeth that are crooked or missing.[1]

People with Williams syndrome often have outgoing, engaging personalities and tend to take an extreme interest in other people. Attention deficit disorder (ADD), problems with anxiety, and phobias are common.[1]

The most significant medical problem associated with Williams syndrome is a form of heart disease called supravalvular aortic stenosis (SVAS). SVAS is a narrowing of the large blood vessel that carries blood from the heart to the rest of the body (the aorta). If this condition is not treated, it can lead to shortness of breath, chest pain, and heart failure. The presence of other heart and blood vessel problems has also been reported.[1]

Additional signs and symptoms of Williams syndrome may include:[1]


  • abnormalities of connective tissue (tissue that supports the body's joints and organs) such as joint problems and soft, loose skin;
  • increased calcium levels in the blood (hypercalcemia) in infancy;
  • developmental delays;
  • problems with coordination;
  • short stature;
  • vision and eye problems;
  • digestive problems; and
  • urinary problems.

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

Medical Terms Other Names
Learn More:
80%-99% of people have these symptoms
Abdominal pain
Pain in stomach
Stomach pain

[ more ]

Abnormality of extrapyramidal motor function
Abnormality of pelvic girdle bone morphology
Abnormal shape of pelvic girdle bone
Abnormality of the neck
Excessive, persistent worry and fear
Narrow opening between the eyelids
Broad forehead
Increased width of the forehead
Wide forehead

[ more ]

Coarse facial features
Coarse facial appearance
Lack of coordination of movement
Elfin facies
Elf-like facial appearance
Elf-like facial features

[ more ]

Prominent eye folds
Eye folds

[ more ]

Everted lower lip vermilion
Drooping lower lip
Outward turned lower lip

[ more ]

Failure to thrive in infancy
Faltering weight in infancy
Weight faltering in infancy

[ more ]

Gait imbalance
Imbalanced walk
Abnormality of equilibrium
Abnormality of balance

[ more ]

High forehead
High hypermetropia
Severe farsightedness
Severe long-sightedness

[ more ]

Hoarse voice
Husky voice

[ more ]

High blood calcium levels
Increased calcium in blood

[ more ]

Increased reflexes
Intellectual disability
Mental deficiency
Mental retardation, nonspecific
Mental retardation

[ more ]

Long philtrum
Low-set, posteriorly rotated ears
Abnormally large tongue
Increased size of tongue
Large tongue

[ more ]

Large ears
Little lower jaw
Small jaw
Small lower jaw

[ more ]

Narrow face
Decreased breadth of face
Decreased width of face

[ more ]

Open bite
Absence of overlap of upper and lower teeth
Open bite between upper and lower teeth

[ more ]

Periorbital edema
Fear of loud sounds
Pointed chin
Pointy chin
Small pointed chin
Witch's chin

[ more ]

Protruding ear
Prominent ear
Prominent ears

[ more ]

Short nose
Decreased length of nose
Shortened nose

[ more ]

Short stature
Small stature
Decreased body height

[ more ]

Thick lower lip vermilion
Plump lower lip
Increased volume of lower lip
Prominent lower lip

[ more ]

Wide mouth
Broad mouth
Large mouth

[ more ]

Wide nasal bridge
Broad nasal bridge
Broad nasal root
Broadened nasal bridge
Increased breadth of bridge of nose
Increased breadth of nasal bridge
Increased width of bridge of nose
Increased width of nasal bridge
Nasal bridge broad
Wide bridge of nose
Widened nasal bridge

[ more ]

30%-79% of people have these symptoms
Abnormal fingernail morphology
Abnormal fingernails
Abnormality of the fingernails

[ more ]

Abnormality of dental enamel
Abnormal tooth enamel
Enamel abnormalities
Enamel abnormality

[ more ]

Joint pain
Attention deficit hyperactivity disorder
Attention deficit
Attention deficit disorder
Attention deficit-hyperactivity disorder
Attention deficits
Childhood attention deficit/hyperactivity disorder

[ more ]

Bladder diverticulum
Blue irides
Blue eyes
Broad nasal tip
Broad tip of nose
Broad, upturned nose
Increased breadth of nasal tip
Increased breadth of tip of nose
Increased width of nasal tip
Increased width of


Williams syndrome is caused by a missing piece (deletion) of genetic material from a specific region of chromosome 7. The deleted region includes more than 25 genes.[1]

CLIP2, ELN, GTF2I, GTF2IRD1, and LIMK1 are among the genes that are typically deleted in people with Williams syndrome. Researchers have found that the loss of the ELN gene is associated with the connective tissue abnormalities and heart disease in many people with this condition. Studies suggest that deletions of CLIP2, GTF2I, GTF2IRD1, LIMK1, and perhaps other genes, may help explain many of the unique behavioral characteristics and cognitive difficulties. Loss of the GTF2IRD1 gene may also contribute to the distinctive facial features often present.[1] The relationship between some of the other deleted genes and the features of Williams syndrome is not yet known.[1]


The diagnosis of Williams syndrome (WS) is established by genetic testing identifying a specific microdeletion at chromosome 7q11.23 (on the long arm of chromosome 7, at a position designated 11.23).[4]

Because the symptoms and severity of WS vary, no single feature is needed to establish the diagnosis.[4] WS may first be suspected in individuals with:

  • Cardiovascular (heart) disease (elastin arteriopathy) any artery may be narrowed. Supravalvar aortic stenosis (SVAS) is the most common heart abnormality, occurring in 75% of people with WS. Peripheral pulmonic stenosis is common in infancy.[4]
  • Distinctive facial features broad forehead, a short nose with a broad tip, full cheeks, and a wide mouth with full lips. In older children and adults, the face appears longer and more gaunt.[1]
  • Connective tissue abnormalities causing a hoarse voice, inguinal or umbilical hernia, bowel or bladder diverticulum, rectal prolapse, joint limitation or laxity, and soft, lax skin.[4]
  • Intellectual disability some degree is present in most people with WS. Some have average intelligence.[4]
  • Strengths in verbal short-term memory and language, and extreme weakness in visuospatial construction.[4]
  • Unique personality overfriendliness, empathy, generalized anxiety, specific phobias, and attention deficit disorder are commonly present.[4]
  • Growth abnormalities prenatal growth deficiency, failure to thrive in infancy, poor weight gain and growth in the first four years, and a brief pubertal growth spurt.[4]
  • Endocrine abnormalities such as hypercalcemia, high calcium urine levels (hypercalciuria), hypothyroidism, and early puberty.[4]

Testing Resources

  • The Genetic Testing Registry (GTR) provides information about the genetic tests for this condition. The intended audience for the GTR is health care providers and researchers. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.


    Treatment for people with Williams syndrome may be individualized depending on the symptoms and severity in each person. Management may include:

    • Feeding therapy for infants with feeding problems
    • Early intervention programs and special education programs for children with varying degrees of developmental disabilities
    • Behavioral counseling and/or medications for attention deficit disorder and/or anxiety
    • Surgery for certain heart abnormalities
    • Medications or diet modifications for hypercalcemia
    • Orthodontic appliances or other treatments for malocclusion of teeth
    • Gonadotropin-releasing hormone agonist for early puberty[4]

    Management Guidelines


      Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

      Organizations Supporting this Disease

        Learn more

        These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

        Where to Start

        • MedlinePlus was designed by the National Library of Medicine to help you research your health questions, and it provides more information about this topic.
        • Genetics Home Reference (GHR) contains information on Williams syndrome. This website is maintained by the National Library of Medicine.
        • The National Institute of Neurological Disorders and Stroke (NINDS) collects and disseminates research information related to neurological disorders. Click on the link to view information on this topic.
        • The National Organization for Rare Disorders (NORD) has a report for patients and families about this condition. NORD is a patient advocacy organization for individuals with rare diseases and the organizations that serve them.

          In-Depth Information

          • GeneReviews provides current, expert-authored, peer-reviewed, full-text articles describing the application of genetic testing to the diagnosis, management, and genetic counseling of patients with specific inherited conditions.
          • Medscape Reference provides information on this topic. You may need to register to view the medical textbook, but registration is free.
          • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
          • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
          • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
          • PubMed is a searchable database of medical literature and lists journal articles that discuss Williams syndrome. Click on the link to view a sample search on this topic.


            1. Williams syndrome. Genetics Home Reference (GHR). December 2014; https://ghr.nlm.nih.gov/condition/williams-syndrome.
            2. Williams syndrome. MedlinePlus. 2017; https://www.nlm.nih.gov/medlineplus/ency/article/001116.htm.
            3. Williams Syndrome Information Page. National Institute of Neurological Disorders and Stroke (NINDS). May 22, 2017; https://www.ninds.nih.gov/Disorders/All-Disorders/Williams-Syndrome-Information-Page.
            4. Morris CA. Williams Syndrome. GeneReviews. March 23, 2017; https://www.ncbi.nlm.nih.gov/books/NBK1249/.

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