Comfrey root helps to heal wounds both internally and externally.  It is a powerful therapeutic curative for gastric and duodenal ulcer, diaphragmatic hernia (it is a significant opening (orifice) through which the esophagus is brought from the chest to the abdomen and is connected to the stomach) and ulcerative colitis. Its astringency helps with bleedings wherever they may appear. It has been used with beneficial results in cases of bronchitis and irritative cough, where it soothes and reduces irritation, whie at the same time it helps with expectoration.