Health Information Library

A buildup of mucus in the nose, head and throat.

A condition in which the body is too low on vitamin D, a nutrient that is important for bones, nerves, muscles and the immune system.

A condition in which the body has too little vitamin B-12, a nutrient that is needed to make red blood cells and DNA.

A buildup of fats, cholesterol and other substances in an artery and on the artery walls. Also called plaque.

A common childhood illness that causes painful sores in the mouth and throat.

Irritation and swelling of the inner lining of the heart's chambers and valves. Usually caused by infection.