For tennis elbow, the standard recommendation is to use a TENS machine at least once per day for 45 minutes per session, continuing daily for as long as symptoms persist. You can use it more frequently if it helps, but one session per day is the minimum that clinical trials have tested. TENS provides short-term pain relief for tennis elbow, though the evidence for its effectiveness as a standalone treatment is mixed.
Recommended Session Length and Frequency
The most commonly cited protocol in clinical research comes from the TATE trial, a randomized controlled trial published in BMC Musculoskeletal Disorders. Participants were instructed to apply TENS to the outer elbow and forearm for one 45-minute session per day, every day that symptoms were present. They were also told they could use the device more often if they wanted to.
There is no strict upper limit on daily sessions, but most people find that one to three sessions per day is practical. If you’re using TENS multiple times a day, spacing sessions out (morning, afternoon, evening) gives you more consistent coverage. The pain relief from a single session is temporary, typically fading within an hour or two after you remove the electrodes, so timing sessions around your most painful activities or before sleep can be more useful than clustering them together.
Where to Place the Electrodes
Place the pads on the outside of your elbow and forearm, directly over or surrounding the area that hurts most. Most people use two electrodes, positioning them on either side of the bony bump on the outer elbow (the lateral epicondyle). Keep the pads a few centimeters apart so the current flows through the painful tissue. Avoid placing electrodes directly on broken skin, and make sure the area is clean and dry before applying the pads.
Which Settings to Use
Clinical guidelines from the Journal of Orthopaedic and Sports Physical Therapy suggest two approaches: burst TENS applied directly over the painful area, or high- or low-frequency TENS applied to acupuncture points near the elbow. Burst mode delivers short clusters of pulses and tends to feel more comfortable for many users. If your device has a burst setting, that is a reasonable starting point.
For conventional (continuous) TENS, a frequency between 80 and 120 Hz with a pulse width around 100 to 200 microseconds is typical for pain relief. Start at a low intensity and increase gradually until you feel a strong but comfortable tingling. The sensation should never be painful. If the tingling fades during a session, it is fine to nudge the intensity up slightly, as your nerves can adapt to a constant signal.
How Well TENS Actually Works for Tennis Elbow
The evidence is honest-to-goodness mixed. TENS can reduce pain in the short term, which is why clinical practice guidelines list it as a “may use” option (their second-lowest recommendation grade, based on limited evidence). The same guidelines note that a large trial of 241 adults found no additional benefit from adding continuous high-frequency TENS on top of standard care, which included education and exercise advice from a doctor. In other words, TENS on its own gave short-term relief, but it did not speed up recovery when people were already doing the right exercises.
This does not mean TENS is useless. For many people, the temporary pain relief makes it easier to do rehab exercises, grip objects, and get through the workday. Think of it as a pain management tool rather than a cure. Combining TENS with ice (cryotherapy) may also improve short-term relief for tennis elbow that has lasted longer than 30 days, according to the same clinical guidelines.
How Long to Continue Using TENS
There is no fixed number of weeks after which you should stop. The practical guideline from clinical trials is simple: use it for as long as symptoms persist and it continues to help. Tennis elbow itself often takes anywhere from 6 months to 2 years to fully resolve, so some people use TENS intermittently for months during flare-ups or heavy workdays.
If you have been using TENS daily for several weeks and notice no difference in your pain levels, it may not be effective for you. Pain relief should be noticeable during or shortly after a session. If it is not, adjusting your electrode placement, trying burst mode instead of continuous, or increasing the intensity (while staying comfortable) are all worth trying before giving up on the device entirely.
Skin Irritation and Safety
Skin reactions are the most common side effect. Roughly 40% of regular TENS users develop some form of contact dermatitis, which can show up as redness, itching, or a rash under the electrode pads. The irritation is usually caused by the adhesive in the pads, the conductive gel, or rubber and nickel components in the electrodes themselves.
To reduce your risk, rotate the exact pad placement slightly between sessions so the same patch of skin is not constantly covered. Remove the pads promptly after each session rather than leaving them on. If you notice redness that does not fade within an hour of removing the pads, or if you see swelling or blistering, stop using the device on that area until the skin heals. Switching to hypoallergenic electrode pads can help if you react to the standard ones.
Electrical stimulation also makes your skin more vulnerable to chemical irritants. Avoid applying lotions, creams, or cleaning products that contain sodium lauryl sulfate (a common ingredient in soaps and moisturizers) to the electrode area during or immediately after a session. Clean the skin with plain water instead.