Throat pain on one side and no pain on the other side may be related to pharyngeal inflammation, ulcers, tumors and other causes. 1. Pharyngeal inflammation: such as acute pharyngitis, acute tonsillitis, etc., the beginning can be manifested as unilateral pharyngeal inflammatory reaction, redness, swelling and pain. 2. Pharyngeal ulcers: If unilateral tonsil or pharyngeal side wall ulcers appear, it can lead to local pain. 3. Pharyngeal tumor: if the surface of the cancer is ulcerated, the patient may have mild throat pain, and the symptoms may gradually worsen with the progress of the disease. If the throat is painful on one side and not on the other side, patients should go to the hospital in time, clarify the cause of the disease, and carry out standardized treatment under the doctor’s guidance, so as to avoid the delay of the disease and bring adverse effects to the body.