Generally, five crystal sugar can be put in a pear, which can moisten the lungs, promote fluid production, clear away heat and resolve phlegm. If used medicinally, it can cure wind-heat, moisten lung, cool heart, eliminate phlegm, reduce fire and detoxify. Modern medical research has proved that pears do have the functions of moistening lung, clearing dryness, relieving cough and resolving phlegm, nourishing blood and promoting granulation. Therefore, it has a good effect on dry throat, itching, pain, hoarseness, thick phlegm, constipation and red urine in patients with acute tracheitis and upper respiratory tract infection. Pear also has the effect of lowering blood pressure and nourishing yin and clearing heat, so it is good for patients with hypertension, hepatitis and liver cirrhosis to eat pears often.