Computer systems to allow users to record sensor readings of their environment and correlate these sensor readings with mental health events for later analysis to improve mental health diagnoses and treatments. A monitoring system comprising a computing device and a sensor set (comprising one or more sensors integral to or communicatively coupled to the computing device) may collect and store data collected about the user. This data may be stored in the computing device, or may be stored in a cloud based data-storage service. This data may be annotated or correlated (either manually, or automatically) with mental health events of the user and used for later analysis.