Lung Channel
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Which point calms the Po (corporeal soul), meaning it can be used to treat emotional disorders such as sadness, grief, weeping, and somnolence?
LU-3 is a Window of Heaven point. One characteristic of Window of Heaven points is that they can treat psycho-emotional disorders. Since grief is the emotion associated with the metal phase, LU-3 can treat grief.
Source: "The Lung Channel of Hand Taiyin." A Manual of Acupuncture, by Peter Deadman et al., Journal of Chinese Medicine Publications, 2007, p. 79 [Q128]