A menstrual rhythm has been documented for exacerbations of
asthma, which may have important clinical relevance to the patient with
severe asthma. We report the case of a 26-year-old patient with
menstruation-associated asthma who showed a dramatic response to oral
contraceptives. It was noted that falls in peak respiratory flow rate
coincided with ovulation. We concluded that oral contraceptive therapy
is useful in this particular group of asthmatic patients.