The adrenal gland grows again one month after surgery, which may be caused by postoperative recurrence, benign and malignant tumors have the risk of recurrence, as explained below. 1. Recurrence of benign adrenal tumor: for benign adrenal tumor, partial adrenalectomy is performed, the residual adrenal tissue may show recurrence of benign tumor or new benign tumor hyperplasia, if the hyperplasia is small, follow-up observation is recommended. 2. Recurrence of adrenal malignant tumor: For adrenal malignant tumor, the chance of recurrence is higher, if the tumor is bigger, there may be residual tumor cells during the operation, and the leftover tumor cells may develop again after the operation, at this time, it is necessary to go to the hospital in time for evaluation and treatment. After adrenal surgery, you should go to the hospital for regular checkups, and at the same time do regular work and rest, and develop good living habits to delay the recurrence of the disease.