Wu Peiyu's second daughter had a common cold and cough. She had previously used medicine to disperse wind, moisten the lungs, and relieve cough, but it was ineffective. Instead, her symptoms worsened with vomiting, thirst, and sore throat. Shi Ran diagnosed her and found that her six pulse conditions were floating and slippery, indicating a response. He prescribed Pinellia powder, and after three doses, her illness disappeared. Someone asked, "Cough, sore throat, and thirst are universally treated by avoiding dry formulas. Why did Pinellia work so effectively here?" Shi Ran replied, "The principles of medication are not easily explained in a few words. When treating illness, one must address the root cause. This was a sudden cough caused by wind evil carrying phlegm attacking upwards, so Pinellia and Cinnamon Twig were used to open the meridians and collaterals, quickly clearing phlegm and saliva, along with Licorice Root to harmonize the spleen and stomach and promote body fluids. When wind phlegm disperses and the nutrient-defense system is unblocked, the sore throat and dry thirst naturally subside. If one stubbornly focuses on the dry thirst and uses cooling and moistening methods, it will only nourish phlegm-dampness, further blocking the meridians and collaterals, and causing body fluids to stagnate. As a result, the dry thirst and sore throat will only worsen, leaving no peace."