Abstract: The present invention is a wearable vital sign monitor. The device is worn preferably about the chest just below the pectoral muscles and monitors at least the following: ECG data, respiration rate, oxygen uptake, pulse rate, and body temperature. These data are collected and analyzed to determine if there is a deviation from the wearer's normal condition, which the device learns. If there is, the device sends a signal to a remote central facility to be received by an attendant who is capable of ascertaining whether the abnormal condition is in fact a warning sign of an adverse health condition. If necessary, the attendant can communicate by voice with the wearer. Optionally, the attendant can locate the wearer, assuming that the wearer is unable to speak, using a ground positioning satellite (GPS) locating system. Finally, the device is capable of producing periodic reports of the recorded data.