The left side of the throat has a foreign body sensation and pain symptoms, the most common in the clinic is because of acute upper respiratory tract infection caused by acute pharyngeal symptoms, its main invasion of the left pharyngeal cavity mucosa, and even acute tonsillitis, acute suppurative tonsillitis, peritonsillar abscess and maxillofacial interstitial infections, acute epiglottitis and so on, will lead to a side of the foreign body sensation and even pain. Of course, there is also a part because of, for example, oral ulcers and glossopharyngeal neuralgia, which can also lead to the symptom of foreign body sensation accompanied by pain on the left side, which is also more common in the clinic. The first step is to go to the ENT department for fiberoptic laryngoscopy to make a clear diagnosis.