A method for predicting the risk of acute airways obstruction of a patient j with chronic respiratory disease, comprising the steps of: taking an already available averaged (population-based) risk curve that quantifies the probability of having a future airways obstruction in at least future days； measuring the inspiratory resistance of one patient j for at least a prefixed number of days； calculating the probability of future acute airways obstruction of the patient j, adjusting the already available averaged (population-based) risk curve with a coefficient k that take into account the inspiratory resistance of the patient j.
