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A rectal fistula is a small tunnel that can form between the anal canal and the skin around the anus.

Heavy, painful or irregular periods are fairly common and can happen when severe changes occur in the typical menstrual cycle.  

A common problem among adults, hemorrhoids can cause rectal bleeding, itching and pain.

Abnormal uterine bleeding is a fairly common condition that refers to irregular bleeding or bleeding between periods.

Parathyroid disorders are characterized by abnormal functioning of the parathyroid glands. The most common disorder of the parathyroid glands is called primary hyperparathyroidism, which is overactivity of one or more of the parathyroid glands.