Common causes of pus in the throat include acute pharyngitis, acute suppurative tonsillitis, acute infectious epiglottitis and other pharyngeal diseases. It can also be seen in some acute infectious diseases and systemic diseases. 1. Acute pharyngitis: common in viral infection, bacterial infection. In bacterial infection, the lymphoid follicles of the posterior pharyngeal wall are enlarged, and yellowish-white punctate exudate can be seen in the center. 2. Acute purulent tonsillitis: generally caused by pathogenic microorganisms such as beta-hemolytic streptococcus, staphylococcus, etc. Examination will find yellowish-white pus spots over the enlarged tonsils or yellowish-white or grayish-white pea-slag-like exudate in the mouth of the crypts. 3. Acute infectious epiglottitis: it is commonly caused by Haemophilus influenzae type B infection, or by viral infection. Laryngoscopy often sees the tongue surface of the epiglottis is swollen and congested, the surface appears yellow pus spots. 4. Other diseases: pus in the throat can also be seen in some acute infectious diseases, such as pharyngopharyngitis, pharyngeal diphtheria, etc. In addition, some systemic diseases can also appear pus in the throat, such as scarlet fever, leukemia and so on. There are many diseases that cause pus in the throat, once the throat is pus, it is recommended that the patient go to the hospital as soon as possible to the Department of Otorhinolaryngology, to identify the cause of the disease and then carry out the relevant treatment.