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Hashimoto's thyroiditis is a condition that can cause an underactive thyroid gland (hypothyroidism). It is also called Hashimoto's

The bacteria Haemophilus influenzae type b (Hib) can cause serious illnesses, including pneumonia (infecting the lungs)

Helicobacter pylori is a type of bacteria that is a major cause of stomach (gastric) and upper small intestine (duodenal) ulcers

Heatstroke occurs when the body fails to regulate its own temperature, and body temperature continues to rise. Symptoms of

A heart attack is an event that occurs when part of the heart muscle does not get enough blood and oxygen. This part of the heart

Heartburn is an uncomfortable feeling or burning pain behind the breastbone. It may occur after eating, soon after lying down

The heat index provides information about how hot it feels outside in the shade. It is a measure of the air temperature in

Heel spurs are small, bony growths on the heel. A spur may develop when the ligament that connects the heel bone to the bones in

Hemolytic disease of the newborn (also called erythroblastosis fetalis) is a serious condition that may occur when the blood types

Hemochromatosis is a condition that occurs when too much iron builds up in the body. Small amounts of iron are normally stored in