Inflammatory processes affecting nasal and bronchial mucosa are similar in nature. Flares of allergic rhinitis may precipitate additional asthma attacks and aggravate the underlying asthma symptoms. Allergic rhinitis is regarded as a risk factor for the development of asthma, especially in the presence of bronchial hyperresponsiveness. Patients with underlying allergic rhinitis are three times more likely to develop asthma when compared with normal subjects. The presence of bronchial inflammation in non-asthmatic patients with seasonal allergic rhinitis is well established.We therefore conducted a study on 60 children to examine whether those with allergic rhinitis without known underlying asthma have impaired spirometry. We compared them with those having allergic rhinitis and asthma, also with others having asthma only. The effect of treatment on spirometric parameters was shown after 3 months.