Excessive drooling after tongue cancer surgery may be caused by normal physiological phenomenon, nerve damage and chemotherapy side effects. 1. Normal physiological phenomenon, it takes a period of time to recover from tongue cancer surgery, during which the swallowing function of patients will be affected to a certain extent, so it is difficult for them to swallow saliva in time, and excessive drooling will occur when it piles up in the mouth, which can be relieved naturally after 2-3 weeks. 2. Nerve damage, during tongue cancer surgery, there may be damage to oral nerves, leaving the sequelae of strong saliva secretion, which can be repaired by drugs or surgery in the later stage. 3. Side effect of chemotherapy, if the patient is undergoing chemotherapy after surgery, the drugs may also cause stimulation to oral mucosa and nerves, which may lead to increased salivation.