Eke Wu (sudden illness caused by invasion of external pathogenic factors, such as Zhong E or sudden death). In cases where there is fecal impaction and interior excess syndrome, Zhang Zhongjing utilizes Beijian Wan. This indicates that for patients with exterior excess syndrome characterized by anhidrosis (absence of sweating), it is inappropriate to use Beijian Wan to purge the interior; rather, Huanhun Tang should be employed to unblock the exterior and induce sweating. The method of purging the interior...