A 14-year-old boy with bronchial asthma who was subsequently diagnosed to have coexistent Addison's disease is presented. Both diseases responded to continuous replacement steroid therapy. We suggest that worsening of bronchial asthma symptoms in this patient may be due to the hypocortisolemia produced by the coexistent Addison's disease. Patients with Addison's disease with clinical evidence of bronchial asthma have rarely been reported [1, 2]. A 14-year-old boy in whom symptoms of bronchial asthma obscured the otherwise obvious diagnosis of adrenocortical insufficiency is presented.