Solid Fire is characterized by a large tongue, thick yellow tongue coating, and rough tongue texture; Deficiency Fire is characterized by a small tongue, and little light and tender tongue coating. Both solid fire and deficiency fire can be seen in red tongue, cracks in the middle of the tongue, and dry tongue coating, but solid fire can also be seen in large tongue, rough tongue texture or even awned tongue, and yellowish thick tongue coating; Deficiency fire can be seen in the tongue body is thin small, tongue texture delicate, light tender, tongue moss less or even appear peeling moss. In addition, the identification of solid fire and deficiency fire should be combined with systemic symptoms to make a comprehensive judgment. The judgment of the tongue should be carried out by professional Chinese medicine practitioners, and individuals should not diagnose or use medication on their own, in order to avoid causing adverse consequences, delaying the condition and jeopardizing health.