Emotional distress or anger damages the liver, causing the liver to fail to function freely, which in turn affects the stomach, leading to symptoms such as nausea, frequent belching, and fullness and pain in the chest and hypochondrium. This is the pathology of liver-stomach disharmony. If prolonged worry and overthinking cause spleen qi stagnation, impairing its normal function and affecting the harmonious descent of stomach qi, symptoms such as reduced appetite, fatigue, epigastric stuffiness, abdominal distension and fullness, belching, acid regurgitation, or even vomiting and diarrhea may occur.