Throat congestion can be caused by acute pharyngitis, acute tonsillitis, peritonsillar abscess and other diseases, need to be vigilant. 1. Acute pharyngitis: acute inflammation of the pharyngeal mucosa and surrounding tissues, can appear throat pain, itching and dryness and other discomforts, due to inflammation stimulation, can cause acute congestion of the throat performance. 2. Acute tonsillitis: due to excessive alcohol consumption, fatigue and chronic diseases of the upper respiratory tract, acute tonsillitis can be triggered, usually more acute onset of the disease, can appear in the early symptoms of sore throat, acute congestion of the throat and tonsil enlargement, but also fever, chills and other systemic manifestations. 3. Peritonsillar abscess: purulent inflammation in the interstitial space around the tonsils, one side of the palato-lingual arch is significantly congested, after the formation of abscess, there will be a side of the soft palate and uvula red and swollen; or one side of the palatopharyngeal arch red and swollen. When congestion occurs in the throat, you should consult a doctor in a timely manner, and under the guidance of a specialist, you should actively carry out appropriate treatment.