Exemplary implementations may provide objective, continuous, and clinically useful assessment of asthma control in subjects including young children using a device that is compact, non-intrusive, and simple. The device may include a water-resistant, flexible patch that can be comfortably worn for two weeks or more. In some implementations, the patch may resemble a Band-Aid® that is placed on the supra-sternal notch. The device may record respiratory sounds that can be analyzed to identify coughing and wheezing episodes. The device may operate in different modes including ones for assessment of nocturnal symptoms, exercise-induced asthma, and overall asthma control. The device may be useful for objectively assessing asthma control to aid clinical therapy, and for an improved way to diagnose exercise-induced asthma.