Etiology and Pathogenesis ■ 1.Excessive Heat in the Lungs and Stomach 2.Retention of Damp Heat 3.Yin Deficiency of the Liver and KidneyEtiology and Pathogenesis ◼ 1.Excessive Heat in the Lungs and Stomach ◼ 2.Retention of Damp Heat ◼ 3.Yin Deficiency of the Liver and Kidney