Soreness and swelling after tooth extraction may be due to the following reasons:1. The patient did not follow the doctor’s instructions after tooth extraction, resulting in local infection, which may cause soreness and swelling or even pain.2. The process of tooth extraction requires bone removal, resulting in the exposure of the roots of the neighboring teeth, which are particularly sensitive when eating cold, hot, sour, sweet and other foods, and soreness and swelling occurs.3. The extraction of an obstructed tooth due to the bad position of the tooth, which may injure the mandibular neural tube, can also result in soreness and swelling, numbness, and even persistent pain. Therefore, patients should strictly follow the doctor’s instructions after tooth extraction, do not brush or rinse within 24 hours, do not eat too cold or too hot food or do strenuous exercise, and do not eat spicy food.