Black tea is produced from the dried leaves of the Camellia Sinesis plant and has anti-inflammatory properties that can help ease stomach pain and inflammation, reducing diarrhea. Unlike white or green tea, black tea goes though an oxidation process that makes it high in antioxidants.
Black tea contains tannin that may be the component responsible for helping to ease diarrhea. When the body undergoes diarrhea, it is because the intestines are inflamed. Black tea can help ease this inflammation and either stop or reduce the severity of diarrhea. Black tea is also beneficial for reducing kidney stones, improving cardiovascular health and lowering blood pressure, as stated by WebMD.