46. The Principles of Oriental Medicine ： Yin and Yang 5

5. Wane and Wax of Yin and Yang (陰陽消長): Yang Deficiency Syndrome (陽虛證)

Yang deficiency syndrome (陽虛證), or a deficiency in Yang, refers to symptoms that occur when the body’s internal fire energy weakens, leading to reduced metabolic activity. One may feel fatigued upon waking and have a persistent desire to lie down. Frequent diarrhea or loose stools are common, especially with mild abdominal pain and diarrhea at dawn. In more severe cases, undigested food may be present in the stool.

People with Yang deficiency are sensitive to cold, especially in the back and abdomen. In winter, not only are the hands and feet cold, but the cold sensation may extend above the elbows or to the knees. Urination becomes more frequent and clearer during winter, and it may feel as though water passes straight through the stomach and out. While nocturia (frequent urination at night) is considered a normal aging phenomenon in the elderly, in younger or middle-aged individuals, it is viewed as a sign of Yang deficiency. People with this condition tend to prefer warmth, sweat even after eating cold food, experience decreased sexual function, and in severe cases, avoid conversations with others.

There is an old saying: “Movement nourishes Yang energy, stillness nourishes Yin energy (動則為陽, 靜則為陰).” If one lacks energy and remains inactive, Yang deficiency will only worsen. Engaging in light exercise around sunrise helps boost internal Yang energy by synchronizing the body with the rising Qi of all living things and the sun—the ultimate source of Yang.

The acupuncture point Zusanli (ST36) stimulates the digestive system, promoting Qi and blood production and strengthening the internal organs, thus replenishing acquired (postnatal) energy. Yongquan (KI1), traditionally activated by tapping to enhance performance on a wedding night, stimulates the reproductive and urinary systems, reinforcing congenital (prenatal) Yang energy. Soaking the feet before bedtime and massaging these two points together is an optimal therapy for those with Yang deficiency, as it strengthens both acquired and congenital energies while providing warmth. If partners (Yin and Yang) soak and massage each other’s feet, their union of energies becomes a true harmony—an ideal state of mutual healing.

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Dr. Jin-man Kim, director of Peace Oriental Clinic