Which herb can stop diarrhea?

• A. Tu Si Zi
• B. Wu Wei Zi
• C. Bai Zhu
• D. He Shou Wu

Answer: (A)

Stopping diarrhea in patterns of deficiency relies on an herb that both binds leakage and supports the organs that hold things together, especially the kidneys and spleen. Tu Si Zi is a classic stabilizer with strong astringent properties and the ability to anchor the kidney essence, which helps prevent stools from becoming loose. It also tonifies kidney yang and jing, reinforcing the body’s structural support to hold in what should be formed stool. This combination—binding action plus deficiency support—makes Tu Si Zi especially effective for chronic diarrhea caused by spleen/kidney deficiency, where the issue is loss of stability rather than excess damp or heat.

Wu Wei Zi can also bind and stop diarrhea, but it’s more of a general astringent with broader uses (thirst, cough, etc.), whereas Tu Si Zi directly targets leakage and deficiency-related stool instability. Bai Zhu strengthens the spleen and dries dampness, which helps diarrhea from dampness or weak SP, but it does so primarily by tonifying qi rather than binding leakage. He Shou Wu is aimed at tonifying liver/kidney blood and nourishing the hair and Jing rather than addressing stool stability. So, for stopping diarrhea, Tu Si Zi provides the most direct, defpattern-specific action.