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Yeast infection (Also called Candida.) - one type of vaginitis, most often caused by the Candida albicans fungus, characterized by itching, burning, or redness of the vaginal area.

Yellow fever - a viral disease that is transmitted by the Aedes aegypti mosquito.

Yin and Yang - Chinese words for complementary and opposite forces that make up the life force (Qi).

Yoga - Indian word for "union." Yoga is a posturing and breathing technique to induce relaxation.