Healthy diets
Learning Center
Hodgkin lymphoma (Hodgkin disease)
Learn how this cancer differs from other lymphomas. Find out about risk factors and treatments, such as chemotherapy, radiation and bone marrow transplant.
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.
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.
Intracranial hematoma
This collection of blood within the skull is a serious, possibly life-threatening, complication of a head injury.
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.
Itchy skin (pruritus)
Learn about causes of this common irritating skin condition and which treatments and self-care measures may provide relief.
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.
Knee pain
Learn about this common complaint, which can result from an injury or medical condition, and find out which treatments may help.
Kyphosis
This excessive forward rounding of the back is often caused by osteoporosis in older women. Spinal malformations can cause kyphosis in infants or teens.
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