Sore left side of the throat and painful gagging need to be treated according to the cause, common causes include acute pharyngitis, acute tonsillitis, herpes pharyngitis and so on. The treatments are general treatment, medication and so on. 1. Acute pharyngitis: acute onset, rapid progress, mainly manifested as dry and itchy pharynx, sore throat and discomfort in swallowing, especially when swallowing pain is obvious. Daily should drink more water, eat fluids, light diet, prohibit smoking and alcohol. Local use of compound borax solution or saline gargle, with hormone nebulizer inhalation, anti-inflammatory and pain relief. 2. Acute tonsillitis: manifested as red and swollen tonsils, obvious sore throat, aggravated by swallowing, can be radiated to the ear. Drink plenty of water, light diet; viral infections can use antiviral drugs or antiviral Chinese patent medicines; bacterial infections need antibiotic treatment, such as cefradine, cefuroxime, amoxicillin, azithromycin and so on. 3. Herpes pharyngitis: clinical manifestations of fever, sore throat, herpes in the pharyngeal isthmus is mainly, and the sore throat is obvious, seriously affecting the swallowing action. Generally symptomatic treatment, fever given antipyretic patch, warm bath physical cooling or ibuprofen, acetaminophen antipyretic analgesic; interferon, ribavirin and other antiviral therapy. If there is swelling and pain in the throat and other uncomfortable symptoms, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to clarify the cause of the disease, targeted treatment. The above drugs should be used under the guidance of a doctor.