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Down syndrome

Down syndrome is a genetic condition present at birth. Learn about the symptoms, complications and outlook for children with Down syndrome.

Diagnosis of heart-related syndromes

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Learn about heart-related syndromes. A syndrome is a medical term for a collection of signs and symptoms that generally stem from a single cause.

Williams syndrome and congenital heart conditions

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Most children with Williams syndrome have a heart or blood vessel problem.

Marfan syndrome and congenital heart conditions

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Marfan syndrome is a rare hereditary disorder of connective tissue. About 60% to 80% of people with this syndrome have heart problems.

Lennox-Gastaut syndrome

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Read about the causes and symptoms of Lennox-Gastaut syndrome epilepsy and how the condition is treated.

Down syndrome: Related medical conditions

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Children with Down syndrome may be at a higher risk for some medical conditions. Learn what these conditions are and how to manage them.

Genetics and heart conditions

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Learn about the role that genetics plays in many heart conditions that afflict children.

Multisystem inflammatory syndrome in children (MIS-C)

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Learn about multisystem inflammatory syndrome in children (MIS-C), a rare syndrome linked to a SARS-CoV-2 infection.

22q11 deletion syndrome (22q11DS)

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22q11 deletion syndrome (22q11DS) is a genetic condition. Learn what causes it, how it's diagnosed and treated.

Post-thrombotic syndrome

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Post-thrombotic syndrome occurs when deep-vein thrombosis damages the vein valves and walls. Learn the signs and symptoms and how it's treated.

CHARGE syndrome

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The effects of CHARGE syndrome differ from one child to the next. Find out how this genetic condition is caused and treated.

22q11 deletion syndrome: Medical features

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22q11DS is a genetic condition with a wide range of symptoms. Learn about some of the more common medical features of 22q11DS.

Shiga toxin-producing E. coli hemolytic uremic syndrome (STEC HUS)

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Shiga toxin-producing E. coli hemolytic uremic syndrome (STEC HUS) is a disease that mainly affects the kidneys and blood cells. Learn about what STEC HUS is, how it affects your child and what to expect during treatment.

Generalized epilepsy syndromes

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Read about the causes, symptoms and treatments for generalized epilepsy syndromes.

Landau-Kleffner syndrome

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Read about the causes, symptoms and treatments for Landau-Kleffner syndrome.

Noonan syndrome and congenital heart conditions

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Noonan syndrome is a genetic condition. Learn about the symptoms and diagnosis of Noonan syndrome and the heart conditions associated with the condition.

Trisomy 18 (Edwards syndrome)

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Information for parents about trisomy 18, a rare genetic condition that causes developmental delay and affects many different organ systems.

Macrophage activation syndrome (MAS)

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Macrophage activation syndrome (MAS) occurs when the immune system is overactivated and causes inflammation. Learn about the signs, causes and treatment of MAS.

Potential complications of heart surgery

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The risk of complications involved with surgical procedures to correct congenital heart disease is very low.

Trisomy 13 (Patau syndrome)

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Information for parents about trisomy 13, a rare genetic condition that causes developmental delay and affects many different organ systems.

Acute myeloid leukemia: An overview

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Learn about how acute myeloid leukemia (AML) develops and what factors may affect the development of the disease.

Supporting your child with a neurodevelopmental disorder through the COVID-19 crisis

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Learn about strategies and ways to help your child with a neurodevelopmental disorder cope during the COVID-19 crisis.

Screen time: How to prevent digital eyestrain

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Hypoplastic left heart syndrome (HLHS)

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Learn about hypoplastic left heart syndrome (HLHS). This condition involves the left side of the heart being underdeveloped, and is extremely serious.

Using your first tampon

Health A-Z

Learn how to insert and remove a tampon, and how to recognize toxic shock syndrome.