Colds are the most common respiratory illness in children. According to Chinese medicine, a cold is caused by the external wind when a person is deficient and has symptoms such as runny nose, cough and headache. Wind is the longest of all diseases, and it can bring other cold, heat, damp and dry evils together to invade the body. Wind-cold cold is characterized by runny nose, fear of cold, white sputum, non-red throat and thin stool, reminiscent of the cold winter and the clear water of Yangtze River. Wind-heat cold, manifested as yellow runny nose, fear of heat, coughing yellow sputum, red throat, dry stool, reminiscent of the summer heat, reminiscent of the turbid water of the Yellow River.