We diagnosis two patients who have severe vertigo and gait inbalance as ‘dizziness due to retention of phlegm’ (痰暈) and gave Zexie-tang(澤瀉湯). They improved enable to walk balance and no more vetigo. Therefore we could assume that Ku-ren-xuan-mao(苦人眩冒) which is the main symptom of Zexie-tang means the vertigo and gait imbalance due to vestibular disorder.