How did the bagua connect yin and yang to Chinese medical thought?

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Moxibustion — traditional Chinese medicine In moxibustion, or moxa treatment, small cones of an herb (typically *Artemisia moxa*) are burned on top of needles placed in designated points of the body, generally the same points as those used in acupuncture.

The bagua connects yin and yang to Chinese medical thought by providing a symbolic framework of eight trigrams composed of continuous and broken lines. These lines represent the fundamental duality of the universe: continuous lines signify yang, representing male, active, and heat-related aspects, while broken lines signify yin, representing female, passive, and cold-related aspects.1

In this system, yin and yang are viewed as complementary forces that exist throughout both the macrocosm of the world and the microcosm of the human body. Ancient Chinese physicians applied this classification to all aspects of health and medicine:

Anatomy: Internal organs and the body's interior are categorized as yin, while the surface and skin are yang.1
Pathology: Diseases are classified as yin if caused by internal factors and yang if caused by external ones.1
Treatment: Therapies are balanced accordingly, with cold or bitter substances acting as yin drugs and hot or pungent substances acting as yang drugs.1

Ultimately, the goal of the physician is to restore balance between these two qualities to heal disease.1