Methods and systems for alerting a wearer of a wearable device of an abnormality are disclosed. The abnormality is detected by a smart device. The smart device then communicates the abnormality to a mobile terminal. The mobile terminal causes the wearable device to detect a current activity status and/or a current environment setting of the wearer of the wearable device. The mobile terminal then determines and communicates to the wearable device a type of warning operation based on the current activity status and environment setting of the wearer. The wearable device then performs the type of warning operation for alerting the wearer.