Tongue coating white is kidney yin deficiency or kidney yang deficiency

White tongue coating generally belongs to kidney-yang deficiency, but it may be caused by other diseases.

For patients with kidney yin deficiency, kidney yin fluid loss, unable to restrict yang qi, can lead to yang qi exposure, resulting in yin deficiency symptoms, more manifested as red tongue less coating. For patients with kidney-yang deficiency, due to yang qi deficiency in the body, yin cold internal excess, cold can stagnate in the tongue, it is easy to appear white tongue coating performance. But white tongue coating can also be seen in other diseases, such as qi and blood loss, unable to nourish the body, can lead to white tongue coating; Secondly, weak spleen and stomach, unable to transport the essence of water grain, leading to water stagnation, but also can cause white tongue coating.