Dampness evil is considered a yin pathogenic (disease causing) influence. When it invades the body, it leads to sluggishness, tiredness, heavy limbs and heaviness in the forehead. Any bodily discharges will tend to be sticky and turbid, and the tongue will have a glossy coat.

濕邪是屬陰的致病因素，侵犯人體會引致疲倦、四肢沉重、遲鈍和額頭沉重。同時分泌物亦會混濁黏稠，舌苔多表現黏滑。