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What is inflammatory bowel disease? Inflammatory bowel disease (IBD) is the name of a group of disorders that cause the intestines to become inflamed (red and swollen). The inflammation lasts a lon...

What are insect-borne diseases? Insect-borne diseases are viral and bacterial illnesses from insect (bug) bites. The most common insects that pass on disease are mosquitoes, sand flies, ticks, and ...

What is insulin resistance? Insulin resistance is a condition linked to prediabetes and type 2 diabetes. It means your body is unable to respond to the amount of the hormone insulin it is producing...

What is heat rash? Heat rash is a skin irritation that stings and makes your skin red. It is also called miliaria or prickly heat. If you have this condition, your skin may feel itchy. Small bumps ...

What is heartburn? Despite its name, heartburn doesn’t affect the heart. Heartburn is a burning feeling in the lower chest, along with a sour or bitter taste in the throat and mouth. It usually occ...

What are heat exhaustion and heatstroke? Heat exhaustion happens when your body gets too hot. If you don’t treat heat exhaustion, it can lead to heatstroke. This occurs when your internal temperatu...

What are hemorrhoids? Hemorrhoids are swollen or inflamed veins in your rectum or around your anus. They are very common, especially in people who are pregnant. The type of hemorrhoid you have depe...

What is hepatitis? Hepatitis is a general term for inflammation of the liver. Normally, the liver breaks down waste products in your blood. But when the liver is inflamed, it doesn’t do a good job ...

What is hereditary hemochromatosis? Hereditary hemochromatosis is a disease in which your body has high levels of iron. That means you have too much iron. It’s often called “iron overload.” Your bo...

What is a hernia? A hernia is a tear in your muscle or tissue that allows part of your insides to bulge out. It can be a bulge of an internal organ or your intestines. Sometimes you can see the her...