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Hiatal hernia
A hiatal hernia occurs when part of the stomach bulges into the chest. It can cause severe heartburn but is treatable.
Hypercalcemia
This condition can weaken bones, create kidney stones, and affect how well the heart and brain work. Treatment depends on the cause.
Hypereosinophilic syndrome
Hypereosinophilic syndrome is a disorder of certain types of white blood cells that can cause life-threatening damage to your organs.
Hyperparathyroidism
Learn about symptoms, tests and treatment for this condition caused by overactivity of the parathyroid gland.
Hypoparathyroidism
Learn more about this uncommon condition in which low levels of parathyroid hormone upsets the balance of calcium and phosphorus in your body.
IgA nephropathy (Berger disease)
This disease causes kidney inflammation that, over time, can interfere with the kidneys' ability to filter waste from the blood.
Indigestion
Is it indigestion or something else? Find out about causes, symptoms and treatment for this common digestive disorder.
Inflammatory bowel disease (IBD)
Chronic diarrhea and belly pain could be caused by inflammatory bowel disease. Learn about IBD causes, diagnosis and treatment.
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.
Intestinal ischemia
Learn about what happens when blood flow to part of the small or large intestine is blocked, and how this serious condition is treated.
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