Yang deficiency constitution refers to a condition where the body’s organs and systems experience dysfunction, leading to insufficient yang energy, which in turn results in internal cold. This is often caused by congenital weakness, external cold invasion, excessive consumption of cold foods, or emotional stress. Traditional Chinese Medicine (TCM) tongue diagnosis can accurately identify the characteristics of a yang deficiency constitution, providing a foundation for subsequent treatment and care. 1. Symptoms of Yang Deficiency Constitution Yang deficiency constitution is most commonly caused by kidney yang insufficiency. The main symptoms include cold hands and feet year-round, a sensitivity to wind and…