Redness and swelling at the base of the throat may be caused by acute pharyngitis, acute tonsillitis or acute epiglottitis. 1. Acute pharyngitis: acute pharyngitis may be caused by pathogenic microorganisms infection, dryness or dust and other environmental factors stimulation, clinical symptoms will be manifested as redness and swelling of the pharynx, pain, difficulty in swallowing and so on. 2. Acute tonsillitis: type B hemolytic streptococcus infection to tonsil inflammation, spread to the throat can often be secondary to upper respiratory tract infection, the main symptom is the emergence of red, swollen, painful throat, and accompanied by fever and other obvious symptoms. 3. Acute epiglottitis: manifested as congestion and swelling of the epiglottis, mostly due to bacterial infections and allergies and other factors, clinically, there can be sore throat, dyspnea, dysphagia and other related manifestations, the examination of the common epiglottis red and swollen and throat red and swollen. Redness and swelling at the base of the throat may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.