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Dual disease of the interior and exterior
表里同病 〔表裏同病〕 biǎo lǐ tóng bìng
Interior and exterior patterns occurring simultaneously when a) cold evil invades both the exterior and interior, creating exterior signs such as aversion to cold, heat effusion, headache, and aching bones, and interior signs such as abdominal pain and diarrhea, or when b) an evil that initially produces an exterior pattern subsequently enters the interior, creating an interior pattern before the exterior pattern is resolved. Two other conditions may be viewed as dual exterior-interior patterns, though by convention they are differently labeled: a new contraction,
which involves the superimposition of an exterior pattern resulting from contraction of one or more of the six excesses on a pre-existing interior pattern; and food damage complication,
where a food damage pattern develops during a pre-existing externally contracted disease manifesting in an exterior pattern.