Tongue root yellow thick may be intestinal heat internal solid evidence, solid heat old phlegm evidence or damp-heat cholera and other causes. 1. Intestinal heat and bowel syndrome: the main manifestations of abdominal hardness and pain, refusing to press, constipation, or heat knot flow, foul odor, strong heat, or sunlight hot flashes, sweating and thirst, or even fainting and delirium (delirium tremens, gibberish), frenzy, short yellow urine, red tongue, moss yellow and thick and dry, or burnt black prickly. 2. Old phlegm evidence of solid heat: the main symptoms are epileptic stupor, or palpitation and palpitation (heartbeat, panic), or coughing and wheezing, or phlegm thick, or chest and epigastric constriction, or dizziness, tinnitus, or tuberculosis around the neck, or mouth and eyes squirming, or insomnia, or strange dreams, or sudden pain in the joints and bones that are difficult to name, or choking and boring, constipation, with a yellowish and greasy tongue, and a slippery, strong pulse. 3. Damp-heat cholera: the main symptoms are chest and epigastric congestion, nausea and vomiting, thirst, thirst for more than drink, distraction, drowning red, diarrhea, or cholera vomiting and diarrhea, yellow and greasy tongue coating, pulse moistening. The root of the tongue is yellow and thick caused by a variety of complex factors, such as the seriousness of the disease should be timely medical treatment, under the guidance of a professional doctor to identify the use of medication.