The text is from Suwen-Tongping Xushi Lun. It provides a definition for deficiency pattern. Essential qi refers to the healthy qi of the human body. "奪" (depletion) means the consumption or depletion of qi. It refers to the deficiency pattern that arises from excessive depletion of healthy qi. For example, prolonged or severe illness can deplete essential qi, or excessive sweating and significant blood loss can injure yang qi and yin fluids, leading to weakened healthy qi and functional decline. Symptoms may include pale complexion, pale lips, fatigue, palpitations, shortness of breath, spontaneous sweating, night sweating, and a weak, thready pulse.