Using a TENS unit for neck, shoulder and headache pain: where the limits are

Can I use a TENS unit for neck, shoulder or headache pain?

You may be able to use one for neck or shoulder pain, but only with your clinician’s guidance. Headache is different. Do not place pads on your head or face, and Medicare lists headache as a condition for which TENS therapy is not considered reasonable and necessary.

A TENS unit sends mild electrical pulses through pads on the skin to treat pain. The neck, head, face and throat sit close to the brain, the airway and major nerves. For that reason, two trusted health sources set firm limits on pad placement there. This guide quotes those limits, then covers shoulder pain, coverage and next steps.

What do the NHS and University of Iowa say about the neck, head, face and throat?

They set limits, and the two pages are not identical. Read both, then ask your clinician about your own body.

The NHS has a short “Don’t” list. It says: “Do not use TENS on your neck, mouth or eyes”. It also says “Do not use TENS on irritated, broken, infected or numb areas of skin” and “Do not use TENS on your chest and back at the same time”.

University of Iowa Health Care has a longer list under “TENS safety.” It says “Do not use TENS on:” and then lists:

• “Any part of your head or face”
• “Any part of your throat”
• “Both sides of the chest or trunk at the same time”
• “Directly on your backbone”

The same page says TENS “may be used to help with many types of chronic (long-term) pain, such as” arthritis or other joint pain, “Back and neck pain”, fibromyalgia, muscle pain and neuropathic pain.

How do these two pages fit together?

They agree on the head, face and throat. They seem to differ on the neck. The NHS says not to use TENS on your neck. University of Iowa Health Care lists neck pain as a use, yet forbids the head, face and throat. The Iowa page does not say where on the neck pads may go.

Do not settle this on your own. Take both statements to your clinician or physical therapist. Ask them to show you exact pad spots for your pain, and to write them down. The NHS also says “A healthcare professional, such as a GP, physiotherapist or midwife can advise you if you’re not sure where to put the sticky pads.” Our pad placement guide and TENS unit safety guide cover general rules.

What helps with neck pain and posture?

Posture and movement matter for many kinds of neck pain, and your clinician can guide you. AHC’s blog has plain reading on screen posture. See the epidemic of text neck and how to correct posture problems. The glossary explains text neck.

What does the research say about TENS and neck pain? A 2022 review in the journal Medicina by researchers at the University of Iowa and Vanderbilt looked at the evidence. It reported: “Seven RCTs representing 651 participants with chronic neck pain were included in a systematic review where the effect of TENS was uncertain due to insufficient evidence.” A table in the same review says one review “found very low certainty of evidence for a difference between TENS compared with sham TENS on reducing neck pain.”

That does not mean TENS cannot help any one person. It means the studies do not give a clear answer. A clinician can weigh your history, then plan a monitored trial. A trial means using the unit for a set time while your clinician checks the results.

What about shoulder pain?

The evidence is uncertain, and pad placement near the neck and chest needs care. The 2022 review says that two systematic reviews of shoulder conditions concluded the effect of TENS was uncertain for rotator cuff impingement and for adhesive capsulitis. It adds that “Overall low quality of evidence and heterogeneity of the comparators, intervention, and outcomes contributed to the uncertainty.”

For safety, keep two rules in mind. Do not place pads on both sides of the chest or trunk at the same time (University of Iowa Health Care). Do not use TENS on your chest and back at the same time (NHS). Shoulder pads sit near both areas. Ask your clinician to confirm the layout. For arm and shoulder topics, see upper extremity pain.

Can a TENS unit help a headache?

Do not place pads on your head or face. University of Iowa Health Care puts “Any part of your head or face” on its do-not-use list. Medicare’s policy also lists headache. In the LCD, the section on chronic pain says the cause “must be a type that is accepted as responding to TENS therapy.” It then says:

“Examples of conditions for which TENS therapy is not considered to be reasonable and necessary are (not all-inclusive): headache visceral abdominal pain pelvic pain temporomandibular joint (TMJ) pain”

That is the LCD L33802 text, in the revision effective January 1, 2024. It is the Medicare policy for the DME MAC that covers Florida (jurisdiction C). Under that policy, TENS used for headache does not meet the coverage criteria. The LCD also says “TENS therapy for chronic pain that does not meet these criteria will be denied as not reasonable and necessary.”

If you get headaches, talk with your doctor. Headache has many causes, and some need prompt care. For the wider topic, see head and neck pain.

What does Medicare say about TENS for neck or shoulder pain?

The LCD does not name neck or shoulder pain. It sets general rules for chronic, intractable pain other than low back pain. All of these must be met:

1. “The presumed etiology of the pain must be a type that is accepted as responding to TENS therapy.”
2. “The pain must have been present for at least three months.”
3. “Other appropriate treatment modalities must have been tried and failed.”

The LCD also requires a trial: “the TENS unit must be used by the beneficiary on a trial basis for a minimum of one month (30 days), but not to exceed two months.” It says TENS for chronic low back pain “will be denied as not reasonable and necessary.” If your neck pain spreads to your back, read our lower back pain guide.

No one can promise coverage. Your clinician must document the pain and your trial. For other plans, check with your plan. Our Medicare coverage guide has the full rules.

What should I expect if my clinician approves a trial?

Expect a slow start, a tingle that is not painful, and clear limits on where pads go. The NHS lists these steps for any TENS machine:

1. Make sure the TENS machine is turned off before you start.
2. Plug the electrical wires into the machine.
3. Place the sticky pads onto clean skin, near the painful parts of your body, and leave a gap between the pads.
4. Turn the machine on.
5. Turn the dial slowly until you feel a tingling sensation. It should not be painful.

Those steps are general. For the neck and shoulder, your clinician sets the exact pad spots, because the head, face, throat, chest and backbone limits all apply nearby.

University of Iowa Health Care adds that the feeling can fade: “After a few minutes, it may seem the stimulation is less. This is normal as your body gets used to the TENS.” It says to turn the intensity up to keep it “strong but comfortable.” It also says: “Is it OK to turn it up to where I just barely feel it? No. Research shows this will not provide pain relief.”

What should I write down during a trial?

Keep a short log your clinician can read. Note the date, where the pads went, how long you used the unit, how the pain felt before and after, and any skin or other problems. Under Medicare’s chronic pain rules, the record must show how often you used the unit, how long you used it each time, and the results. Your log supports that record. Do not guess. Write what happened, including days when it did not help.

When should I call my clinician?

Call if your skin turns red or itchy, or if you get a headache, dizziness or nausea. University of Iowa Health Care says to stop using TENS and talk with your doctor or health care team for those signs. It also says to “Call your health care team for help if you cannot get relief.” Do not move pads toward your head, face or throat to chase relief.

What other safety rules apply?

Follow your clinician’s and your device’s instructions. Do not use TENS while you sleep, bathe, drive or use machinery. The NHS says “Do not use TENS if” you have epilepsy, have a pacemaker, or are pregnant “unless your doctor or midwife tells you to”. University of Iowa Health Care says not to use it with a cardiac pacemaker or defibrillator, a spinal cord stimulator, or any implanted metallic or electronic device.

Turn the unit off before you place, move or remove pads. If you get skin irritation, headache, dizziness or nausea, stop and talk with your doctor. See the full list in our safety checklist.

Next step

Talk with your doctor or physical therapist about the cause of your neck or shoulder pain. Ask where pads may safely go. Then call AHC at (800) 749-1188 or use contact.

This page gives general information, not medical advice. Talk with your doctor or physical therapist about your own care, and follow your clinician's and your device's instructions. In an emergency, call 911.