About This Tradition

Chinese medical texts first reached Japan through Korea and direct contact with Tang Dynasty China. The earliest significant Japanese medical text is the Ishinho, compiled by Yasuyori Tamba in 984 CE. It drew heavily from Chinese sources but reflected the beginning of Japanese adaptation. Over the following centuries, Japanese physicians received Chinese texts, studied them, and gradually modified the clinical framework to suit their patient population and available plants.

The Edo period (1603 to 1868) saw the most significant divergence from Chinese medicine. Practitioners like Yoshimasu Todo (1702 to 1773) argued for a return to the classical Chinese formulas of the Shang Han Lun (a foundational TCM text from circa 200 CE) and rejected later elaborations of the theory. This movement, called Koho-ha (the school of ancient methods), stripped Kampo down to a core set of well-tested formulas and emphasized direct clinical observation over theoretical frameworks.

When Western medicine was mandated by the Meiji government in the late 19th century, Kampo was pushed out of official practice. It was not fully rehabilitated until the 1970s, when clinical research reestablished its efficacy and the Japanese Ministry of Health approved a set of 148 standardized Kampo formulas, most of which are now covered under national health insurance. This standardization is one of Kampo's most distinctive features compared to TCM: patients receive one of a fixed set of formulas based on pattern recognition, not individually constructed prescriptions.

Key Principles

• Standardized formulas (kampo-yaku): Kampo practice centers on approximately 148 government-approved formulas, derived from classical Chinese texts, each with fixed herb ratios. Practitioners match patients to formulas based on pattern recognition rather than building individual prescriptions from scratch.
• Sho (pattern recognition): The practitioner identifies a patient's sho, their overall pattern of symptoms and constitution, and selects the formula that fits. This requires a precise match between the patient's presentation and the formula's known indications, developed from centuries of clinical observation.
• Hara (abdominal diagnosis): Kampo practitioners assess the abdomen through palpation to determine organ function and constitutional type. This is a clinical skill not emphasized to the same degree in TCM.
• Smaller materia medica: Kampo uses a more limited set of herbs than TCM, focused on those with the strongest clinical track record in the classical formulas. The emphasis is on depth of knowledge about fewer plants rather than breadth across thousands.
• Quality control: Because Kampo operates within the Japanese pharmaceutical regulatory system, herbs used in approved formulas must meet defined quality and potency standards, distinguishing them from unregulated herbal products.
• Culinary-medicinal overlap: Several Kampo herbs are also everyday Japanese foods, particularly burdock root (gobo), which appears in both clinical formulas and daily cooking.

Herbs in This Tradition

• Burdock: Called "gobo" in Japanese; a culinary staple and a medicinal plant used in Kampo formulas for skin conditions, liver support, and lymphatic complaints; the root is rich in inulin and bitter compounds that support digestive and liver function
• Ginkgo Biloba: One of the oldest tree species on earth; traditionally used in Japanese and Chinese medicine for memory support, circulation, and vertigo; ginkgolides and bilobalide are the primary studied compounds; standardized leaf extracts are among the most researched botanical preparations in modern clinical literature

Related Preparations

• Decoctions (to or tang): Multiple dried herbs simmered together in water for 20 to 40 minutes, then strained and drunk. The standard preparation method for Kampo formulas, derived from classical Chinese practice.
• Granule extracts (ekisu-zai): Concentrated powdered extracts of standardized Kampo formulas, dissolved in hot water before drinking. The most common form used in modern Japanese clinical practice because they allow precise dosing and eliminate the need for patients to decoct raw herbs at home.
• Culinary preparation (gobo as food): Burdock root is sliced, sauteed, simmered, or pickled in Japanese cooking. Its daily culinary use means that many Japanese people consume it as a functional food without treating it as medicine specifically.
• Standardized ginkgo leaf extract: Concentrated preparations standardized to 24% flavone glycosides and 6% terpene lactones, the ratios used in most clinical research. Not a traditional preparation format but the form in which ginkgo has been most thoroughly studied.