Many children have internal heat, which is manifested in the following ways. The first manifestation is fire in the oral cavity, because internal heat often leads to inflammation of the oral cavity, such as ulcers on the tip of the tongue and herpes on the oral mucosa, and even pus in the tonsils. Secondly, if the internal heat is mainly liver heat, the eyes will often become red and have a lot of eye stools. Then, internal heat may also manifest as abnormal bowel movements, such as dry stools, very infrequent bowel movements, even once every 2-4 days, very yellow urine, and small volume of urine.