Mucus in the mouth may be a physiological oral reaction, or gastrointestinal dysfunction, pharyngitis, etc.. 1. Physiological oral response: such as children’s milk teeth, permanent teeth eruption, oral discomfort, may feel the mouth has spit endless mucus. Generally do not pay attention to. 2. Gastrointestinal disorders: such as reflux esophagitis, dyspepsia, etc. can easily lead to excessive saliva in the mouth, appearing in the mouth with endless mucus. 3. pharyngitis: throat discomfort, will also feel the mouth have spit endless mucus. Mucus in the mouth may also have other pathological factors, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.