《黄帝内经·灵枢·口问》
所以悲伤、哀怨、愁苦、忧伤的情绪会牵动心神，心神不安就会使五脏六腑皆受影响，继而波及各经脉，经脉的波动使得各条排泄液体的通道尽皆开放，液道开放，所以鼻涕和眼泪会同时涌出。
故悲哀愁忧则心动，心动则五脏六腑皆摇，摇则宗脉感，宗脉感则液道开，液道开故泣涕出焉。
Therefore, emotions such as sadness, sorrow, distress, and sorrow can affect the mind, and anxiety can affect the five viscera and six bowels, and then affect the meridians. The fluctuation of the meridians opens up all the channels for the discharge of liquid, and the liquid channel opens, so the nose and tears will flow out at the same time.