Aerobic exercise
Learning Center
Kidney cysts
These round, fluid-filled pouches on or in the kidneys are sometimes discovered during imaging tests. Find out when treatment may be needed.
Itchy skin (pruritus)
Learn about causes of this common irritating skin condition and which treatments and self-care measures may provide relief.
Ischemic colitis
Ischemic colitis occurs when a part of the colon experiences a decrease in blood flow. It can cause serious complications but usually resolves on its own.
Intracranial hematoma
This collection of blood within the skull is a serious, possibly life-threatening, complication of a head injury.
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.
Influenza (flu)
Learn more about the symptoms, causes and prevention of this potentially fatal viral infection that attacks the respiratory system.
Infectious diseases
Viruses, bacteria, fungi and parasites can all cause infection. Find out more about how to prevent and treat these conditions.
Hypospadias
Hypospadias is a birth defect in which the opening of the urethra is located on the underside of the penis instead of the tip. Learn about treatment.
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.
Hydrocele
Find out more about the symptoms, causes and treatments for this swelling in the scrotum.
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