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Hantavirus cardiopulmonary syndrome (HCPS) is a potentially fatal respiratory illness caused by a virus found in the saliva, urine

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

Laparotomy is a procedure in which a surgeon makes an incision in the lower abdomen in order to inspect the abdominal cavity

In the United States, people are legally blind if their best eye has 20/200 vision or less with the help of glasses or contact