Abstract: One method for detecting a change in health status of a patient includes: accessing a log of use of a native communication application executing on a mobile computing device by the patient; selecting a subgroup of a patient population based on the log of use of the native communication application and a communication behavior common to the subgroup; retrieving a health risk model associated with the subgroup, the health risk model defining a correlation between risk of change in a medical symptom and communication behavior for patients within the subgroup; predicting a risk of change in a medical symptom for the patient based on the log of use of the native communication application and the health risk model; and transmitting a notification to a care provider associated with the patient in response to the risk of change in the medical symptom for the patient that exceeds a threshold risk.