As an external influence, [Dampness] obstructs the movement of [Qi], producing fullness of chest or abdomen and incomplete urination or defaecation. It causes stiffness in the joints and heaviness in the limbs. The lower body is especially affected. The [Spleen] is especially sensitive to [Dampness]; signs of a distressed [Spleen] are loss of appetite, indigestion, nausea, diarrhoea and swollen abdomen. Spleen dysfunction may allow [Fluids] to accumulate, creating a state of internal [Dampness], which is distinguished from external [Dampness] by arriving less suddenly and with less acuteness. Mucous ([tan]) is a form of internal [Dampness].