Cracked tongue should be grooved tongue, which is mainly related to congenital heredity, vitamin B deficiency and psoriasis. 1. Congenital heredity: due to the existence of gene variations in certain parts of the autosomes, under the influence of gene variations, the symptom of having a cracked tongue will appear, which is a normal situation and usually does not need to worry. 2. Lack of vitamin B: Due to the long-term lack of vitamin B in the body, the liquid in the body is low, the tongue is in a dry state, and cracks will appear. 3. Psoriasis: The symptoms of cracked tongue can be caused by the disorders of immune regulation function, which leads to the appearance of plaques on the skin in the tongue area. After the tongue cracks, it is recommended to go to the hospital in time, eat more fresh fruits and vegetables and drink more water in daily life, which can effectively alleviate the tongue cracks and reduce the appearance of symptoms.