The pain of swallowing spit (saliva) is considered to be related to acute tonsillitis, acute epiglottitis, and improper diet. 1. Acute tonsillitis: usually secondary to upper respiratory tract infections, inflammation of the tonsils will be manifested as fever, pharyngeal pain, dysphagia and other symptoms, and then the phenomenon of sore throat when swallowing spit. 2. Acute epiglottitis: acute epiglottitis can be triggered when the epiglottis is infected with viruses and bacteria, resulting in swelling of the epiglottis and pain in the pharynx, and the swallowing action will directly stimulate the epiglottis and cause pain to aggravate. 3. Improper diet: Eating too hot or spicy stimulating food, can make the mucous membrane of the pharynx stimulation caused by congestion, edema, easy to swallow saliva sore throat. Throat sore throat swallowing saliva may also be related to other reasons, it is recommended to consult a doctor in a timely manner to clarify the cause, and standardized treatment under the guidance of the doctor.