Biofeedback is a way to control a body function that you normally don't control in a conscious way, such as skin temperature, muscle tension, heart rate, or blood pressure. Biofeedback techniques can be used to manage tension and migraine headaches, back pain, panic or anxiety attacks, irritable bowel syndrome, fibromyalgia, and other conditions.
Learning biofeedback requires practice in a lab or other setting under the guidance of a trained therapist. Many kinds of biofeedback devices and programs are available for personal use, including devices that can be worn.