The pathogenic condition know as Heat can arise from many factors including environmental and climatic stresses, dietary excesses, emotional distress, fatigue due to hyperactivity, the side effects of Western pharmaceuticals, allergic reactions, infections, and so forth. Translated into the descriptive terminology of Chinese traditional medicine, Heat may be the outcome of invasion by adverse external influences (Wind-Cold or Wind-Heat), stagnation of Qi, stagnation of Blood, accumulation of Phlegm or Food, ingestion of poisons, hyperactivity of Yang (Life Fire), deficiency of Yin, or agitation of the Shen (Mind) due to psychic distress. Regardless of the predisposing influences, Internal Heat can lead to depletion of Yin Moisture and Essence, reckless movement of the Blood, propagation of Internal Wind, withering of the Blood and Marrow, insecurity of the Shen, and sudden collapse of the Qi which are manifested, respectively, as fever and dehydration, hemorrhage or the appearance of petechiae, vertigo or seizures, mania or hysteria, and heat prostration. Purge Heat eliminates Internal Heat from within all three Burners as well as from the defensive (Wei), active (Qi), nutritive (Ying), and constructive (Xue) levels of metabolic activity.*