Biofeedback is defined as the use of any device to improve a person’s ability to detect, identify, and modify physiological processes in their body. The typical processes that are measured include muscle activity, peripheral circulation (indicated by finger temperature), sweat gland activity, respiration, and heart rate. Biofeedback has been repeatedly shown to be a powerful tool in the treatment of a wide range of pain and stress-related problems, disorders related to autonomic nervous system functioning, and anxiety disorders. Biofeedback has also been used to improve focus and performance in athletes and others. Biofeedback combined with cognitive-behavioral strategies can be a valuable tool to help people address the physiological components of their current difficulties.