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Nerivio is a wearable device for treating acute pain, such as migraines or muscle spasms. The device uses transcutaneous electrical nerve stimulation (TENS) to deliver pain-relieving pulses to the affected area through the skin. Nerivio is portable and can be worn on the arm or leg, allowing patients to receive treatment for their daily activities. It is typically used as an alternative to prescription or over-the-counter pain medication.