You don't state where the tendinitis is. If you go to your doctor they can recommend and write a referral to a physical therapist who can fit you for the proper device. To just take a product off the wall at the store may not be the perfect item for your problem. Also physical therapists can utilize a topical corticosteroid treatment (script for the cream you pick up at pharmacy) where they use heat and ultrasound with the cream to try and reduce the tendinitis. I have had this done. Less than successful for me due to underlying osteoarthritis and fibromyalgia as well as widespread tendinitis. I have been dealing for years and no success yet. But I think my tendinitis is a fore-teller of the OA, the next site yet to be evident on xray. If you get this cream DO NOT USE IT for home emergency treatments: bug bites, irritated skin and so on.