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Biofeedback is a mind-body therapy that teaches a person how to control their body's vital functions. Sensors placed on the body are used to monitor functions such as heart rate, blood pressure, skin temperature, and muscle or nerve activity. The patient is made aware of this information by sight (visual) signals, sound (auditory) signals, or body-muscle signals. The patient learns to control body functions they want to change by visualizing or imagining changes in the sensor signals. Biofeedback is commonly used as a complementary therapy for high blood pressure, headache and migraine, chronic pain, stress and asthma. In some cases, relaxation exercises are used along with this treatment.