A system for monitoring the state of health of a patient suffering from respiratory disease comprising a portable medical device, said device comprising a) a flow measurement device (3) capable of performing a spirometry measurement, and b) a sensor able to perform an oxygen measurement or a measurement of blood oxygen saturation and heart rate； said sensor is of the reflecting photometric touch type (7), the system comprising storage means and comparison means in which a personalised plan of action for the patient is stored against which the spirometry and/or oxygen measurement data found are compared so as to display the result of such comparison on the display of a device connected to the internet so as to define the patient's state of health and identify exacerbation of the disease on the basis of data obtained from both such spirometry and oxygen measurements. A method for monitoring the health of a patient suffering from respiratory disease implemented through the system indicated above is also claimed.
