What should you know about using a TENS unit on an arm?

Electrical pulses delivered through the skin can change how pain signals are felt while the unit is running. TENS does not repair a fracture, tendon injury, infection, or nerve problem, so the reason for arm pain still matters. Do not place pads across the chest, over the front of the neck, on broken skin, or on areas with reduced feeling. Keep the unit off while applying or moving electrodes.

Wash and dry the skin, then place electrodes around the painful region with space between them, following the device instructions. Avoid joints if movement will pull the pads, and check the skin after removal. Use a low, comfortable setting first. If arm pain follows a new injury, allow a clinician to check the injury before relying on stimulation; swelling, splinting, or numbness can change what is safe.

Get urgent care for arm pain with chest pressure, breathlessness, sweating, sudden weakness, facial drooping, or trouble speaking. Prompt assessment is also needed after a serious injury, or when the arm is deformed, cold, pale, markedly swollen, or losing strength. Stop TENS if it causes burning, a rash, increased numbness, or worsening pain.

Ask where pads belong for your specific pain, whether movement or a brace affects placement, and whether numbness or circulation changes make TENS unsuitable. Discuss the diagnosis and the exercises or treatment that should accompany pain relief.