What is the primary use of moxa on DU-4 in treatment?

The primary use of moxa on DU-4, also known as Mingmen or Gate of Life, is to tonify Yang. This acupuncture point is located near the lower back and is closely associated with the Kidney Yang energy, which is essential for supporting various physiological functions, including metabolism, warmth, and overall vitality.

Moxibustion involves burning mugwort herb near the acupuncture point, which generates heat and enhances the warming effect. This is particularly beneficial for addressing conditions associated with Yang deficiency, such as fatigue, coldness, weakness, and low libido. By focusing on warming and invigorating Yang energy, practitioners aim to restore balance and improve overall health and vitality.

While other options like tonifying Qi, expelling cold, and nourishing Blood each have their own significance in TCM, they are not the primary focus when specifically using moxa on DU-4. The heat provided through moxibustion is specifically geared towards enhancing Yang energy, making it the most appropriate choice for this question.