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Oral Thrush. A cracked tongue may indicate an oral yeast infection, or oral thrush. Oral thrush is caused by the accumulation of the candida fungus in the lining of your mouth.In addition to cracks, symptoms of oral thrush include pain, loss of taste and lesions on the tongue and other areas in the mouth.our sore, cracked tongue may also result from a deficiency in biotin, a B vitamin noted for its role in energy metabolism and fat synthesis. Other symptoms of deficiency include pale or gray skin, muscle pain, weakness, fatigue and dry skin, according to the Better Health Channel website.
However, sometimes a coated tongue can indicate an infection or more serious condition. 1  You should see your GP for advice if: 2  you're concerned about changes to the appearance of your tongue. 3  your tongue hurts (read about the causes of tongue pain) 4  your coated tongue persists for longer than two weeks.