The common causes of pain in neighboring teeth after tooth extraction are damaged gums, dental caries, and secondary oral infections. 1. Damaged gums: two teeth next to each other, in the extraction process, may have caused damage to the gums of neighboring teeth, thus causing pain. 2. Dental caries: the neighboring tooth itself has a cavity, after the extraction of the tooth, the neighboring tooth pulpitis and other causes of pain. 3. Oral secondary infection: the cavity after tooth extraction is susceptible to bacterial infection, causing irritation to the periodontal tissues and causing pain in the neighboring teeth after extraction. There may be other reasons for the pain in the teeth next to the back of the extracted tooth. It is recommended that you go to the hospital specialist in time to improve the relevant examination and standardized treatment under the guidance of the doctor.