Cracked tongue with no tongue moss in the middle of the tongue is due to the high level of fire and heat in the body, and heat in the center of the middle jiao injuring the fluids. Cracked tongue is a pathological condition of the tongue in Chinese medicine, which is mainly manifested by the appearance of cracks or fissures on the tongue surface of varying amounts, shades and shapes, caused by a variety of reasons and suggesting different pathological changes in the organism. The Yellow Emperor’s Classic of Internal Medicine says that “all illnesses that are internal must be externalized”, and that the tongue is closely related to the five organs of the human body. The tongue corresponds to the upper, middle and lower jiao from front to back, and the appearance of cracks in the middle of the tongue and the absence of tongue moss indicates that the middle jiao of the body is suffering from heatiness and the drying up of fluids. Generally, patients also have other symptoms such as dry mouth and constipation. When the above tongue coating changes and physical discomfort occur, it is recommended to go to a regular Chinese medicine hospital as soon as possible for standardized diagnosis and treatment.