Swollen and sore throat is a clinical symptom, and there are many reasons for this symptom, as follows: a. Dietary factors: The more common reason is caused by improper diet, such as swelling of the mucous membrane of the throat after eating spicy and irritating food, and some patients are caused by eating allergic food. Inflammation and infection factors: Some patients are caused by acute inflammatory reactions in the throat, such as herpes pharyngitis, acute pharyngitis, acute laryngitis, acute purulent tonsillitis, peri-tonsillar abscess, and some patients are caused by parapharyngeal space infection. There are individual differences in the specific causes of the disease. After the onset of the disease, it is recommended to visit the ENT department, where routine blood tests and laryngoscopy can be done to help determine the condition and make a clear diagnosis for targeted treatment.