Left sore throat is most often seen in peri-tonsillitis or peri-tonsillar abscess. It is recommended to go to the ear, nose and throat to have the doctor examine the throat to see if there is congestion and redness of the tonsils and if there is any abscess formation. Look at the soft palate and the anterior arch to see if there is congestion and elevation. If it is peri-tonsillitis, it is recommended to intensify anti-inflammatory treatment and apply hormones if necessary. If the doctor diagnoses a peri-tonsillar abscess, a local incision and drainage should be performed along with anti-inflammatory and hormonal treatment, after which the pus should be released. If the pus is not released in time, there is a certain risk when the pus invades the peripheral space of the neck. All in all, this disease must be treated by ENT.