Feeling a nerve jumping inside after root canal treatment may be a normal phenomenon, or it may be caused by external stimulation and inflammatory reaction. 1. Normal phenomenon: After root canal treatment, if the patient has localized throbbing pain or feels that there are nerves jumping inside, it is usually a normal phenomenon, and it will be gradually relieved in about 3 to 5 days. 2. External stimulation: If there is obvious nerve throbbing pain, it may be caused by the mechanical stimulation of root canal equipment or chemical stimulation of drugs during the treatment. Usually there will be a significant improvement after a period of time. 3. Inflammatory reaction: If the patient’s symptoms are more obvious and accompanied by severe pain, it may be caused by the inflammatory reaction due to wound infection. To summarize, if the patient does not have obvious symptoms of discomfort, there is no need to worry too much. If obvious discomfort occurs, you should go to the hospital in time to avoid delaying your condition.