Yang deficiency is a term used in traditional Chinese medicine (TCM) to describe a condition where a person's yang energy, which is associated with warmth, movement, and activity, is deficient. An antonym of yang deficiency would be yang excess, where a person has an excessive amount of yang energy. Yang excess is characterized by symptoms such as fever, agitation, restlessness, and hyperactivity. Another antonym for yang deficiency could be yin deficiency, where a person's yin energy, which is associated with coolness, stillness, and receptivity, is deficient. Yin deficiency is characterized by symptoms such as hot flashes, night sweats, dryness, and insomnia. TCM practitioners aim to restore balance between yin and yang energies to maintain optimal health.