The symptoms of sore throat may be caused by the following reasons: 1. It is possible that viral or bacterial infection of the throat may lead to acute pharyngitis, with significant congestion and edema of the mucous membrane of the throat, which will stimulate the mucous membrane of the throat when swallowing saliva, and therefore cause painful symptoms. 2. 3. If a child has a sore throat when he swallows saliva, he should also pay attention to the possibility of herpes pharyngitis or hand, foot and mouth disease caused by an intestinal virus infection. Whether it is herpes pharyngitis or hand-foot-mouth disease, there are blisters in the mouth of the child, there will be ulcers, swallowing saliva will stimulate the ulcer surface to cause pain, so it is recommended that patients go to the hospital for examination and treatment.