Japanese abdominal diagnosis or Fukushin is the diagnostic art developed in medieval Japan based on the canonical writings by Zhang Zhongjing. Careful inspection of the Shanghan Zabing Lun reveals countless references to abdominal conditions that could only have been diagnosed by actual palpation of the abdomen. The skill however never fully developed in China but flourished in Japan. Fukushin 腹診 refers specifically to the style of abdominal diagnosis developed by Japanese scholars during the Edo period (1603-1867 CE) for the purpose of prescribing the Han dynasty formulas of Zhang Zhongjing.

The Shanghan Zabing Lun is the first historical manual to teach the treatment of both acute and chronic complex diseases that have been triggered externally or have arisen from internal damage. Though a classical work, it is of great clinical value for modern day practice.