The Lungs are most vulnerable to grief and loss, and when in imbalance will predispose a person to feeling grief and loss.

 The Liver is most vulnerable to anger and frustration, and when in imbalance will predispose a person to feeling anger and frustration. 

The Kidneys and Bladder are most vulnerable to fear, and imbalance in the Kidneys will predispose a person to feeling fear. The Kidneys are most vulnerable to Cold; hence, the increased problems in winter and in some cases, following winter (if the Kidneys are not built back up). (The Lungs to Dryness, and the Liver to Wind.)

 In addition, each meridian has a proper direction of flow of energy, and each emotion can have an effect on the direction of flow of Qi. Fear frequently causes Qi to descend. People wet their pants when frightened. In children fear and/or insecurity almost always causes Qi to descend and can be the cause of a child wetting the bed at night. (Foods which cause Qi to descend also can do this.) However, Maciocia has found that fear can have more variable effects in adults. In some cases, it will cause Qi to descend. 

But in other cases it can trigger Kidney Yin Deficiency which in turn triggers Deficiency Heat (Yin Deficiency) in the Heart. Fear also " depletes the Essence " (Jing), and " blocks the Upper Burner " (Heart and Lungs) " which makes Qi descend to the Lower Burner