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"A fistula is an abnormal connection between two parts inside of the body. Fistulas may develop between different organs, such as between the esophagus and the windpipe or the bowel and the vagina. They can also develop between two blood vessels, such as between an artery and a vein or between two arteries.\n\nSome people are born with a fistula. Other common causes of fistulas include:\nComplications from surgery\nInjury\nInfection\nDiseases, such as Crohn's disease or ulcerative colitis\n\n\nTreatment depends on the cause of the fistula, where it is, and how bad it is. Some fistulas will close on their own. In some cases, you may need antibiotics and/or surgery."
<https://medlineplus.gov/fistulas.html>