Han Wen-hui points out that it is traditionally believed that the worst thing that can happen to a woman during confinement is to come down with a cold or the flu (called the "lying-in flu"). As a result, they aren't supposed to go outside, wash their hair, bathe or touch cold water, and doors and windows must be kept shut.
韓文蕙指出，傳統認為坐月子期間最忌感冒、受風寒（即所謂月內風），因此不准洗頭、洗澡、碰冷水，也不准外出走動，甚至在房間裡也要窗門緊閉。