Pharyngitis is usually caused by an enterovirus infection, and clinical symptoms vary greatly depending on the severity of the pharyngitis disease. Usually, mild pharyngitis presents with a mild to moderate fever for one to two days, but severe pharyngitis disease is very acute and presents with a sudden onset of hyperthermia, capable of reaching a temperature of 40°C for five to seven days before the temperature drops, and in cases of hyperthermia, symptoms of hyperthermic convulsions, irritability, vomiting, and diarrhea are extremely likely to occur. The clinical symptoms of pharyngitis include high fever, restlessness, loss of appetite, drooling, general malaise, sore throat, and rapid onset. For some younger patients, pharyngitis may be accompanied by vomiting and convulsions, and the oral mucosa may easily develop a few grayish-white herpes. Some patients may also experience increased salivation and refusal to drink and eat because of ulcers in the isthmus, which can easily cause pain in the pharynx when eating and watering. There are several common symptoms when the organism suffers from pharyngitis such as the above, and the symptoms are very similar to those of HFMD. It is important to distinguish between the two to avoid misdiagnosis and delay in the treatment of the condition.