Dr. Ivan Karasev, an oncologist, announced that the appearance of a sticky white layer on the tongue may indicate cancer in the digestive system. In an interview with doctorpiter.ru, the specialist points out that changes in the tongue could be a sign of digestive problems. According to him, the tongue serves as a mirror of human health. A change in the color and structure of the tongue can indicate stomach ailments. The doctor emphasizes that diseases of the digestive system can be diagnosed from the condition of the tongue, including cancer. And he adds, in this case, the tongue is…