There are 24 solar terms in a year and 24 hours a day. This is the rhythm of the sun and the rhythm of life. Although a year and a day are different on the scale of time, there is no lack of similarities in the rhythm of life. Traditional Chinese medicine believes that the body's qi and blood flow along the meridians, like tides, with rhythm. The day travels fifty degrees, of which twenty-five degrees travels in yang, the other twenty-five degrees travels in yin, fifty degrees is a week. The "tide" of the movement of qi and blood reaches different meridians at different times, and twelve hours correspond to twelve meridians. "Tidehead" contains extraordinary energy, which has repair and healing functions for the human body. During the repair process, the body's corresponding parts of the meridians may have physiological reactions, such as the "tide head" reaching the lung meridian at 3 to 5 in the morning. If the lung is ill, cough and asthma will occur at this time. Similarly, choosing the right time for treatment will also achieve a multiplier effect.