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The Tens unit can be a completely drug-free cure for the pain that you have been looking for. These devices can cure your pain without letting you have any sort of drugs or medicines. But in severe cases, you will have to consult the doctor for your pain as you might not feel at ease by using these devices. Anyway, how do they cure your pain without drugs? This process of curing is known as transcutaneous electrical nerve stimulation; in this process, the tens unit delivers a current with a weak force that stimulates the veins and nerves and eases your pain in an optimal way.