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What causes a fistula? After an abscess has been drained, a passage may remain between the anal gland and the skin, resulting in a fistula. If the gland does not heal, there will be persistent drainage through this passage. If the outside opening of the fistula heals first, a recurrent abscess may develop.
Less commonly, fistulas can develop between: 1  the windpipe (trachea) and the gullet (oesophagus) (called a tracheo-oesophageal fistula). 2  the gullet and the lungs, the main airways to the lungs (bronchus), or the windpipe (called a broncho-oesophageal fistula). 3  the stomach and the bowel (called a gastro-colic fistula).istulas are more common in the pelvic area. Fistulas are a rare side effect of cancer treatment. They can also develop as the result of a cancer growing. Symptoms of a fistula depend on where it is in the body. Common symptoms include: 1  leaking urine through the vagina or back passage.