Swelling of the throat may be caused by acute tonsillitis, pharyngeal diphtheria, malignant tumor of the tonsils and other factors. 1. Acute tonsillitis: the onset of acute tonsillitis, usually lead to symptoms of swelling of the throat, may also be accompanied by sore throat, high fever, dysphagia and other symptoms. 2. Pharyngeal diphtheria: usually caused by diphtheria bacillus, which can cause irritation to the throat, leading to swelling of the throat, further aggravation of the lesions, and may also extend to the lungs, which may be accompanied by weakness, fever, nausea, vomiting and other symptoms. 3. Malignant tumor of tonsil: when malignant tumor occurs in tonsil area, with the increase of tumor volume, it will lead to enlargement of throat, and there may be ulcers on the surface, and accompanied by bad taste in mouth, difficulty in swallowing, sore throat and other symptoms. After the onset of the disease, it is recommended to consult a doctor as soon as possible for examination to clarify the cause of the disease.