There are many reasons for a sore throat and yellow sputum, such as acute pharyngitis, bronchitis and pneumonia. 1. Acute pharyngitis: bacterial infection can occur in the throat mucosal congestion and edema, inflammatory secretions increase, so the phenomenon of a little pain in the throat yellow phlegm, accompanied by coughing, foreign body sensation in the throat and other symptoms. 2. Bronchitis: Bronchitis can also cause a little pain in the throat yellow phlegm phenomenon, accompanied by nasal congestion, runny nose, coughing phlegm phenomenon. 3. Pneumonia: Pneumonia is the attack of pathogenic bacteria in the lungs, which can cause a bit of pain in the throat and yellow phlegm, accompanied by cough, fever and other symptoms. There are a lot of reasons why you may have a sore throat and yellow phlegm, so it is advisable to go to the hospital for a complete checkup after the symptoms appear, and then follow the doctor’s instructions to standardize the use of medication and treatment.