A cold tongue may be a precursor to stroke, spleen deficiency, stomach cold, heart yang deficiency and other diseases. 1. Stroke: Stroke is a brain disease that occurs when qi and blood are in rebellion, resulting in paralysis of the brain veins or blood overflowing outside the brain veins. Because of the obstruction of qi and blood, the skin and tendons are not moistened, so there are aura symptoms before the onset of the disease, such as dizziness, headache, numbness of limbs, and a strong and cold tongue. 2. Spleen deficiency: Spleen deficiency may be related to dietary factors, mental factors, physiological factors, disease factors and lifestyle. Spleen qi deficiency, malfunction of blood control and poor transportation of water and grains are often seen, and patients may have precursor symptoms such as enlarged tongue and cold tongue. 3. Stomach Cold: Stomach cold is mainly caused by overeating cold food, irregular diet, cold environment, mental stimulation and other factors. Patients may have stomach pain, pale mouth, pale tongue, white tongue, cold tongue and other precursor manifestations. 4. Heart Yang Deficiency: Heart Yang Deficiency refers to the insufficiency of yang qi in the heart and the internalization of deficiency and cold, which is mostly related to factors such as insufficient endowment (inborn constitution and poor functioning), overthinking, loss of nourishment in prolonged illnesses, and old age and infirmity. Patients may have precursor manifestations such as weakness of limbs, pallor, fear of cold, and cold tongue. If the above symptoms occur, it is recommended to consult a doctor in time and standardize the treatment under the doctor’s guidance.