Abstract: A physiological-condition monitoring system is attached to a person for providing monitored physiological data signals. A computer system processes the physiological data signals to determine whether the person may have suddenly experienced fear by comparing the monitored physiological data with stored stress profile data for the person. The stress profile data is based upon prior measurements of the monitored physiological conditions of the person during situations of stress. When such processing by the computer system determines that the person may have suddenly experienced fear, the computer system provides an alarm-indication signal to an initial alarm indicator. If the initial alarm indication was false or if the condition causing the person to suddenly experience fear was very brief and no longer poses a threat, the person can operate an alarm deactuation switch to cause the computer system to discontinue the alarm indication signal.