Gallbladder qi is the essential qi of the gallbladder and also the substantial foundation and driving force for the gallbladder to excrete bile and govern decision-making. It is the nutrient substance originated from the qi of the whole body to fulfill its designated function. The gallbladder is in charge of decision- making and regulating emotions, playing an important role in mental activities. People with guts (gallbladder qi) are not susceptible to mental stimulation and could recover soon from the attack if there is any. People without guts are often irresolute and hesitant, and are apt to experience timidity, fright, fear, insomnia, dreaminess, etc. when attacked by some bad forms of mental stimulation.