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Yawning involves opening the mouth involuntarily while taking a long, deep breath of air. This is usually done as a result of drowsiness or weariness. Excessive yawning is yawning that happens more often than would be expected, even if drowsiness or weariness is present.
Review Date:
1/18/2007
Yaws is a chronic infection caused by the bacteria Treponema pertenue, which primarily affects the skin, bones, and joints.
Review Date:
11/27/2006
Review Date:
11/9/2007
Yellow fever is a viral infection transmitted by mosquitoes.
Review Date:
11/1/2007
This is poisoning caused by eating pieces of the Yew plant.
Review Date:
3/21/2006