This document summarizes evidence from research studies on the effectiveness of biofeedback-based interventions for various health conditions, rating the level of evidence on a scale from 1 to 4. It finds level 1 evidence for biofeedback helping problems like anxiety, arthritis, asthma, chronic pain, diabetes and others. Higher levels of evidence (3-4) are found for biofeedback reducing headaches, high blood pressure, insomnia, irritable bowel syndrome and temporomandibular disorders. The strongest evidence is for randomized controlled trials comparing biofeedback to no treatment or an alternative.