Tongue diagnosis is a practice used in traditional medicine, particularly in Traditional Chinese Medicine (TCM), to assess a person's health. By examining the color, shape, and coating of the tongue, practitioners can gain insights into the body's internal conditions. For example, a pale tongue may indicate a deficiency of energy, while a red tongue could suggest heat in the body. This method is based on the belief that the tongue reflects the state of various organs and systems. It is often used alongside other diagnostic techniques, such as pulse diagnosis, to create a comprehensive picture of a person's health and guide treatment decisions.