Fiery pain on the surface of the tongue is mostly due to inflammation of the papillae of the tongue due to vitamin or trace element deficiency in the body. Due to the lack of vitamin B, vitamin C, or iron and zinc in trace elements in the body can inflame the papillae of the tongue, causing a fiery pain on the tongue, accompanied by taste disorders and numbness of the tongue. If you suffer from oral mucosal dryness syndrome, it will also cause hot and spicy pain in the tongue, which is caused by the impaired function of salivary glands due to immune dysfunction and the severe decrease of salivary function leading to extreme dryness in the mouth. When talking and eating, it will cause pain in the tongue after a long time, and it is very difficult to swallow dry food.