Sore throat on the left side of swallowing may be caused by left throat foreign body, left tonsil peritonsillar abscess, left parapharyngeal interstitial abscess, and so on. 1. Foreign body in the throat: when the patient’s throat has a foreign body, such as the left side of the throat inside the stuck fishbone or bone, it will cause the phenomenon of swallowing the left side of the throat pain. 2. Left tonsil peritonsillar abscess: Inflammatory lesions that occur in the peritonsillar space may be an early localized inflammatory reaction. Deterioration of the lesion will cause localized abscess, and then the phenomenon of swallowing the left side of the sore throat. 3. left parapharyngeal space abscess: left parapharyngeal space abscess is mainly caused by its own trauma, posterior pharyngeal space purulent lymphadenitis, mainly manifested in the left pharyngeal swelling, pain, difficulty in swallowing and many other symptoms. Swallowing the left side of the throat pain, there may be left pharyngeal ulcers, left pharyngeal tumors and other causes, the patient should be timely hospital consultation, diagnosis is clear, choose targeted treatment.