According to the statistics, about 1/4 of the patients have significant relief of muscle weakness symptoms after surgery and they remain stable. About 3/4 of the patients have recurrent muscle weakness symptoms about 20 days after surgery and need to be treated with medication, and the chance of recurrence of muscle weakness symptoms becomes very small after the treatment is relieved. (Thymectomy is like cutting down the disease-causing tree, but the seeds sown in the land around it cannot be removed together, so some patients need to be treated with medicine again to remove all the remaining seeds.)