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Learning Center
Diarrhea
Learn more about what causes this common digestive condition, and how you can treat and prevent it.
Diphtheria
This rare but serious bacterial infection can cause organ damage and breathing problems. This disease is often treatable but is also preventable with a vaccine.
Down syndrome
Down syndrome is a genetic disorder caused when abnormal cell division results in extra genetic material from chromosome 21.
Dural arteriovenous fistulas
Learn about these rare, irregular connections that can occur between arteries and veins in the protective covering of the brain and spinal cord.
Dust mite allergy
Dust mite allergy can lead to year-round sniffles and sneezes. Here's how to find relief.
Dwarfism
Very short stature of 4 feet 10 inches or less that results from a genetic or medical condition is considered dwarfism. Learn about causes and treatment.
Dyslexia
This learning disorder involves difficulty reading due to problems identifying speech sounds and learning how they relate to letters and words.
Ear infection (middle ear)
These usually get better on their own, but sometimes medicine is needed. Find out more about how doctors diagnose and treat this common ear condition.
Earwax blockage
Learn simple steps for treatment and self-care of this common problem, including earwax removal.
Ebstein anomaly
In this rare heart defect, the tricuspid heart valve didn't form properly. This can affect the heart's ability to pump blood. Know the risks and symptoms.
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