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Learning Center
Hydrocephalus
Learn about this potentially fatal condition that causes fluid buildup in the brain. It can cause a range of symptoms, from headaches to poor balance.
Hydronephrosis
Learn about this condition that occurs when urine doesn't drain properly from the upper urinary tract, leading to kidney swelling.
Hypoplastic left heart syndrome
Learn more about this rare congenital heart condition that results in underdevelopment of the left side of the heart.
Hypospadias
This condition happens before birth. The opening of the urethra is on the underside of the penis instead of at the tip. Learn about treatment.
Impetigo
Learn about the symptoms, causes and treatment of this highly contagious bacterial skin infection common in infants and young children.
Infant reflux
Learn more about when a baby spits up food or liquid. Most babies outgrow this common and messy condition by the age of 18 months.
Infectious diseases
Viruses, bacteria, fungi and parasites can all cause infection. Find out more about how to prevent and treat these conditions.
Influenza (flu)
Learn more about the symptoms, causes and prevention of this potentially fatal viral infection that attacks the respiratory system.
Inherited metabolic disorders
Caused by gene changes, these disorders affect the body's ability to change food into energy. They also affect how energy is used, such as for cell repair.
Insomnia
This disorder can make it hard to fall asleep, hard to stay asleep or both, even though you have the chance for enough sleep. It can drain your energy.
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