The phenomenon of swollen throat and pain in swallowing may be caused by acute pharyngitis, acute tonsillitis or acute epiglottitis. 1. Acute pharyngitis: acute inflammation of the mucosa, submucosal tissues and lymphatic tissues in the human pharynx, usually caused by viral and bacterial infections and other factors, due to inflammatory stimuli resulting in local mucosal congestion, vasodilatation, mucosal epithelium and submucosal edema. As a result, there may be a swelling of the throat and pain in swallowing. There is a phenomenon of sore throat and pain in swallowing. 3. Acute epiglottitis: acute inflammatory lesions of the epiglottis and its surrounding tissues, which can be manifested as severe sore throat, dysphagia and dyspnea, and so on, so there can be a sore throat and sore swallowing. The symptoms of sore throat and pain in swallowing are all painful, it is recommended to consult the hospital, diagnosis and treatment.