Sudden pain in the throat that causes difficulty in swallowing should be examined under fiberoptic nasopharyngoscopy of the pharyngeal cavity to see if there is any lesion that is causing the increased pain. For example, acute pharyngitis, purulent tonsillitis, peri-tonsillar abscess, infection of the maxillofacial space, as well as acute epiglottitis and acute laryngitis. The pain is mostly due to swelling and congestion of the surrounding mucosa caused by inflammation, and the swallowing difficulty caused by pain when swallowing. At this time, anti-inflammatory and symptomatic treatment should be given, and cefradin capsules and cefuroxime sodium tablets can be taken orally. If its suppuration, you can add the hormonal drug prednisone tablets, and a peri-tonsillar abscess is formed. In case of maxillofacial interstitial infection, local incision and drainage should be considered to release the pus followed by antibiotic treatment. If its difficulty in swallowing is due to symptoms in the esophagus, such as esophagitis, esophageal cancer, etc., then a gastroscopy should be performed to clarify the diagnosis.