Biofeedback is the process of gaining greater awareness of many physiological functions primarily using instruments that provide information on the activity of those same systems, with a goal of being able to manipulate them at will. Some of the processes that can be controlled include brainwaves, muscle tone, skin conductance, heart rate and pain perception.
Biofeedback may be used to improve health, performance, and the physiological changes that often occur in conjunction with changes to thoughts, emotions, and behavior. Eventually, these changes may be maintained without the use of extra equipment, for no equipment is necessarily required to practice biofeedback.
Biofeedback therapy can help recovering individuals understand and control involuntary body functions such as blood pressure, muscle contractions, breathing and heart rate. As alcohol or drug withdrawal symptoms often lead to physical stress and heightened involuntary physical responses, utilizing biofeedback can help eliminate common symptoms of drug withdrawal, such as: anxiety, depression, chronic muscle pain and restlessness.
Information provided above is courtesy of: https://nccih.nih.gov