The redness, swelling and pain in the throat may be due to acute pharyngitis, acute tonsillitis, acute pharyngitis, and overeating too much irritating food. 1. Acute pharyngitis: when the patient has acute pharyngitis, there will be redness, swelling and pain in the throat, and in serious cases, the patient will have difficulty swallowing. 2. Acute tonsillitis: Acute tonsillitis refers to inflammation of the tonsils, and the patient will also manifest as a red, swollen and painful throat. In addition, the patient may also have low-grade fever, fatigue and other systemic symptoms. 3. Acute epiglottitis: Acute epiglottitis refers to inflammation caused by inflammation of the epiglottis, and the patient will have obvious redness, swelling and pain in the throat, and severe respiratory difficulties, even life-threatening. 4. Overeating too much stimulating food: Some patients eat too much stimulating food such as spicy and hot food in a short period of time may also lead to redness, swelling and pain in the throat. When there is redness, swelling and pain in the throat, it is important to clarify the specific cause under the guidance of the doctor. Deal with it proactively to avoid serious consequences.