What is “three volts”? When we describe a person as a diligent learner, we often say that he is not afraid of the cold and heat. The three volts here is what we usually call the “three volts” of the “three volts”. Yesterday was the first day of the first three volts, major hospitals, clinics and pharmacies are doing “three volts stickers”, in full swing. The three volt paste for cold disease has a very good therapeutic effect, so popular with patients. The “three volts” include the first volt, the middle volt, the last volt, the general interval between the two volts 10 days, there are generally three times, there are also some years are four, such as this year there are four times, so this year the three volt paste paste four times. How are the “three volts” calculated? The third g day after the summer solstice is the first volt (first volt), the fourth g day is the middle volt (second volt), and the first g day after autumn is the last volt (third volt), the first volt and the last volt are ten days each, the middle volt is ten or twenty days, and the “three volts” are thirty or forty days in total. Why is it necessary to apply the compress at the time of the three volts? “The three volts is the strongest time of the year, when the yang of the sky dominates heaven and earth, and the weather is hot. For example, girls with Yang Qi deficiency, cold hands and feet, and menstrual disorders will have their symptoms relieved in the hot summer; rheumatoid arthritis, cold pain in the back and legs, who like warmth and fear cold, will feel relief in the cool summer; elderly people with perennial bronchitis, asthma, and easy to catch a cold will have their symptoms relieved in the day of volcano. This is a rare time of the year when sufficient yang energy is available and is applied to the body surface by means of compresses made of pungent and warm medicines. This is to open up the meridians, warm up the yang energy and get rid of the cold. This is in line with the principle of “prevention before illness” and “treatment before illness”.