It wasn't just stomach pains that caused Julianne Hough to rush to the emergency room after last Tuesday's live 'Dancing With the Stars' show. The professional dancer and country singer has been diagnosed with Endometriosis.

Endometriosis occurs when extra tissue is found outside the uterus, where it is not supposed to grow. It is a common condition that happens to 5-10% of women of reproductive age.

To help treat the condition, Hough will undergo minor surgery to remove her appendix. She will talk about the surgery on tonight's 'Dancing With the Stars,' where the two-time champ will also perform with dancing partner Cody Linley.

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