Tongue spirit is one part of the whole body spirit. It manifests in the tongue  color and tongue body movement, especially the rosiness and movement of the tongue. Rosy, flexible and moist tongue indicates the presence of spirit. While greyish, darkish awkward tongue indicates the abscence of spirit. The stomach qi of tongue is mainly manifested by the growing conditions of tongue fur. Tongue fur sticks tightly to the surface of tongue and is hard to be scraped off or the fur continues to grow after being scraped, which are considered as rooted fur, indicating the presence of stomach qi.
Tongue fur loosely floats and is easy to be scraped or hard to grow or even peeled as a mirror, which are considered as rootless fur. indicating the decline of stomach qi. The tongue manifestation with spirit and stomach qi indicates non-decline of healthy qi or mild pathogenic condition and favorable prognosis. The tongue manifestation without spirit and stomach qi means deficient healthy qi or worse pathogenic condition and unfavorable prognosis. To learn more information, please click Relationships Among Six Fu-Organs.