Rhubarb root is used regulate the digestive tract to treat digestive issues that include diarrhea, constipation, stomach pain, and acid reflux. Rhubarb root softens stool to ease bowel movement and reduce pain from hemorrhoids and tears of the lining of the anus. Rhubarb root is used to treat kidney stones and kidney disease and to remove acid and mucus and to intracellularly cleanse cells.