If there is painful swelling of the flesh at the back of the mouth, which in clinical terms generally refers to swelling and pain at the gums inside the mouth, it is usually considered as a symptom caused by wisdom tooth pericoronitis, in addition, inflammation of the gums can also lead to pain at the back of the mouth: 1. Wisdom tooth pericoronitis: due to the late eruption of wisdom teeth, and due to the short jaw bone, wisdom teeth usually lack sufficient space to erupt, which in the long run can lead to crooked growth, or only reveal Half of the tooth or part of it may not be fully erupted. If the immune system is low due to emotional irritability and lack of sleep, the wisdom teeth may become inflamed and cause pericoronitis, resulting in pain. The actual gum disease is a result of the fact that the gums are not only in the inner part of the mouth, but also in the dead center of the mouth, which is not easily cleaned, so it is easy to leave food residues here. The accumulation of residue for a long time leads to the appearance of plaque or calculus in the peripheral parts of the gums here, which can easily lead to the occurrence of gingivitis, which will also appear swollen and painful at the gums inside the mouth. The inflammation can gradually subside after the plaque and calculus are removed by scaling, or if the symptoms are more severe, antibacterial medication can be applied. In addition, also consider patients with viral pharyngitis, may be due to pharyngeal congestion, resulting in mucosal tissue redness, swelling and pain, thus manifesting as swollen and painful flesh at the back of the mouth, so it is recommended that patients promptly seek medical diagnosis to clarify the treatment modality to promote the elimination of symptoms. Patients should also pay attention to maintaining oral hygiene, actively brush their teeth, and rinse their mouth with mouthwash or saline after meals.