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Effective Tens Unit Stimulator Portable For Lower Blood Pressure / Neck And Shoulder What Pain is TENS useful For? People have reported good results from using TENS machines and TENS therapy for many types of pain and ailment. The effectiveness of TENS therapy of course varies from patient to patient and case by case. Pain is the bodies warning sign to tell the brain there is a problem in the body. In nature, this is useful - a dog with a thawn in it's paw feels the pain and