Cracked tongue may be caused by psoriasis, lack of vitamin B2 and other substances in the body, which is usually not a precursor of stomach cancer. Stomach cancer usually lacks specific precursors. Some patients may have symptoms such as loss of appetite, vomiting and nausea, epigastric discomfort, postprandial bloating and acid reflux in the early stage of stomach cancer, and abdominal pain, emaciation, loss of appetite, and weight loss in the progression of the disease. Therefore, the appearance of fissured tongue is usually not related to stomach cancer. When suffering from psoriasis, fissured tongue can appear, and the lack of vitamin B2, niacin and other substances in the body can also lead to the symptoms of fissured tongue. It is recommended that patients pay attention to the oral cavity, clean to avoid tongue infection, the emergence of discomfort timely medical treatment.