Biofeedback is most helpful for conditions involving muscle tension. It's a particularly useful therapy for reducing stress and anxiety, and the NIH has approved its use in the treatment of chronic pain and insomnia. Biofeedback can be used as both a primary and secondary treatment. Secondary treatments are used in conjunction with traditional medicine. In these cases, biofeedback would be used to deal with the trauma or fear of having a disease like cancer; the pain associated with the condition; and the nausea from chemotherapy. Biofeedback is a secondary treatment for diseases like multiple sclerosis, Crohn's disease and other conditions that are not considered curable by biofeedback, although some symptoms of these conditions can be alleviated with this therapy.