Generally speaking, garlic boiled with rock sugar can relieve lung dryness and cough. Garlic has the efficacy of detoxification and elimination of swelling, killing insects and stopping dysentery; rock sugar has the efficacy of strengthening the spleen and stomach (restoring the function of the spleen and stomach), moistening the lungs and relieving cough. Garlic is pungent in flavor and warm in nature. Attributes to the spleen, stomach and lung meridians. It is used for carbuncle sores, scabies, consumption, cough, diarrhea and dysentery. Rock sugar, sweet flavor, neutral. Attributed to the spleen, lung meridian. Used for spleen and stomach qi deficiency, lung dryness cough, sputum with blood and other symptoms. The two boiled water can relieve lung dry cough, cough, diarrhea, dysentery and so on. There are many reasons for coughing, common external cough and internal injuries cough two categories, including external cough accompanied by runny nose, sore throat, body fever and other abnormal symptoms; internal injuries cough is mostly caused by chronic strain, different causes of cough, the treatment and the drugs used are not the same, the patient should not be indiscriminate use of medicines, and must be strictly in accordance with the doctor’s instructions.