The text is from the Treatise on Cold Damage Diseases . Wei refers to the defensive yang qi on the body's surface, and Ying is the material basis of sweat. Disharmony between nutrient and defensive qi generally refers to the pathology of exterior pattern spontaneous sweating. Exterior pattern spontaneous sweating has two scenarios: one is "weak defense qi and strong nutrient." Due to the weakness of the defensive yang qi, it loses its ability to secure the exterior, and sweat spontaneously leaks out. Clinically, this manifests as no fever but occasional spontaneous sweating. The other is "strong defense and weak nutrient," where yang qi is stagnated on the surface, forcing the nutrient yin inward, leading to spontaneous sweating. Clinically, this manifests as occasional fever and spontaneous sweating, with no sweating when there is no fever. Strength and weakness are relative, and the treatment method is to use Cinnamon Twig Decoction to support the righteous and expel the pathogenic, harmonizing the nutrient and defensive aspects. However, the timing of taking the medicine should differ: for those with fever and spontaneous sweating, the medicine should be taken before the fever; for those with no fever but spontaneous sweating, the timing of taking the medicine is not restricted.