Electrical Stimulation

Drug-free electrical stimulation (TENS, EMS, NMES) eases long-term pain and rebuilds muscle. It also speeds your recovery from injury, delivered at Remix Medical in Houston, TX.

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By Alham Samani, DC · Doctor of ChiropracticReviewed Apr 7, 20242 min read

Key takeaways

Electrical stimulation delivers low-voltage pulses through skin electrodes; TENS modes modulate pain signaling, while EMS and NMES produce muscle contractions for strengthening and re-education.
It is painless, drug-free, and low-risk, producing only a tingling or tapping sensation, in sessions of about five to fifteen minutes.
A large 2022 meta-analysis found moderate-certainty evidence that TENS lowers pain intensity versus placebo, though guideline bodies remain cautious because many older trials were small.
It is a low-risk adjunct that works best combined with manual therapy and exercise, and for TENS a home unit can support ongoing self-management.
It is avoided over a pacemaker or defibrillator, the front of the neck, the head, a pregnant uterus, malignancy, or areas of active infection or clot.

Whenever you are recovering from an injury, stroke, fibromyalgia pain, or any soft tissue conditions, one of the most beneficial treatments recommended is a physical therapy procedure known as Electrical Stimulation (ESTIM). The painless procedure of ESTIM accelerates recovery and relieves pain from several symptoms, and is widely used by physical therapists in every rehabilitation program.

ESTIM stimulates electric pulses into the body to mimic the action of signals coming from your nervous system. Muscles and nerves are the main targets of these electric pulses. These mild electrical pulses help train your muscles to respond to natural signals of the body.

Types of Electrical Stimulation

TENS (Transcutaneous Electrical Nerve Stimulation): Electrodes are placed on the skin targeting the sources of pain. When the electrodes stimulate the pulses to nerve fibers, they block or reduce pain signals reaching the brain. TENS therapy is useful in treating both chronic and acute pain.
EMS (Electrical Muscle Stimulation): Similar to TENS, but uses rhythmic contractions to aid in building muscle strength. EMS uses a slightly stronger current than TENS to contract muscles.
ESTR (Electrical Stimulation of Tissue Repair): Used to relieve pain by reducing swelling and increasing blood circulation.
IFC (Interferential Current): Pulses beneficial in reducing pain.
NMES (Neuromuscular Electrical Stimulation): Useful in increasing strength and restoring muscle functions.
FES (Functional Electrical Stimulation): Aims at providing long-term stimulation to preserve muscle and motor skills.
SCS ( Spinal Cord Stimulation): Relieves spine-related pain and discomfort.

How Does ESTIM Work?

ESTIM uses small electrodes — sticky pads placed on the skin of the affected area with wires attached to the ESTIM device. A stream of electric pulses reaches the muscles causing them to contract. The pulses aimed at the nervous system stop the pain signals from reaching the spinal cord and brain. Natural pain-relieving chemicals called endorphins are also stimulated by these electric pulses. The process typically takes around 5 to 15 minutes.

Approach	What it involves
What it does	Gentle electrical pulses relax muscles and interrupt pain signals
What it feels like	A mild tingling or tapping sensation — not painful
Best for	Muscle spasm, stiffness, and soft-tissue pain

Conditions Treated by ESTIM

Back pain and joint pain
Arthritis
Muscle conditioning and weakness
Nerve inflammation
Urinary incontinence
Stroke rehabilitation
Post-surgery rehabilitation
Fibromyalgia
Dysphagia
Muscle injuries
Cancer pain

Benefits

Relief from chronic pain
Strengthening of weakened muscles
Athletic recovery
Retraining muscles post-surgery
Reduces swelling and atrophy prevention
Improved blood circulation
Increased range of motion

How it's performed

Self-adhesive electrode pads are placed on the skin over or near the target area and connected to a small stimulator. A controlled stream of low-voltage electrical pulses is delivered, and the parameters differ by mode. TENS targets sensory nerves to modulate pain signaling and prompt endorphin release; EMS and NMES use stronger currents to produce muscle contractions for strengthening and re-education; interferential current uses crossing medium-frequency currents for deeper, more comfortable penetration. Intensity is set to a strong but comfortable level — a tingling or tapping sensation, never painful. A session usually runs five to fifteen minutes and is often combined with manual therapy and exercise.

How to prepare

No preparation is required, and there is no fasting. The skin should be clean and intact where the pads are placed. Tell the clinician about any pacemaker or implanted device, pregnancy, epilepsy, or areas of numbness before treatment.

What to expect after

Response is reviewed over the course of visits, with pain and functional measures guiding whether to continue and whether a home TENS unit is worthwhile. As an adjunct, its continued use depends on whether the overall plan is helping; it is not relied on as a sole treatment. Patients whose pain does not respond are reassessed and, where indicated, referred for further evaluation.

Outcome

Patients commonly report reduced pain and muscle relaxation during and shortly after treatment, and muscle-stimulation modes can help maintain or rebuild strength during rehabilitation. The evidence is moderate: a large recent meta-analysis found TENS lowers pain intensity versus placebo, though guideline bodies have been cautious because many older trials were small. It is a low-risk, drug-free adjunct that works best within an active, exercise-based plan.

Frequently asked

Electrical Stimulation questions, answered

What is electrical stimulation therapy?

It uses gentle electrical pulses to relax muscles, ease spasms, and interrupt pain signals. It's a comfortable, drug-free treatment done in the office.

Does electrical stimulation hurt?

No, most people feel a mild tingling or tapping sensation that's set to your comfort. Many find it relaxing.

Is electrical stimulation safe?

It's a low-risk treatment, though it isn't used in certain situations, such as with a pacemaker or over some areas. Your provider checks first.

How long does an electrical stimulation session last?

Sessions usually last several minutes and are done as part of a broader treatment plan. Your provider sets the number of visits.

Does electrical stimulation actually work?

For pain, a large 2022 review found moderate-quality evidence that TENS reduces pain intensity compared with a placebo device. Guideline bodies have been more cautious because many older trials were small, so we use it as a low-risk add-on rather than a stand-alone cure.

What is the difference between TENS and EMS?

TENS targets sensory nerves to reduce pain. EMS and NMES use a stronger current to make the muscle contract, which helps rebuild strength and re-educate muscle after injury or surgery.

Can I use a TENS unit at home?

Often, yes. For appropriate patients we can set up a home unit and teach safe pad placement and settings for ongoing self-management.

Who should not have electrical stimulation?

It is not used over a pacemaker or implanted defibrillator, the front of the neck, the head, or a pregnant uterus, and it is avoided over cancer, infection, clots, or numb areas. We screen for these first.

Sources

References

Johnson MI, Paley CA, Jones G, Mulvey MR, Wittkopf PG. Efficacy and safety of transcutaneous electrical nerve stimulation (TENS) for acute and chronic pain in adults: a systematic review and meta-analysis of 381 studies (meta-TENS). BMJ Open 2022;12(2):e051073 — https://doi.org/10.1136/bmjopen-2021-051073
Gibson W, Wand BM, Meads C, Catley MJ, O'Connell NE. Transcutaneous electrical nerve stimulation (TENS) for chronic pain — an overview of Cochrane Reviews. Cochrane Database Syst Rev 2019;(4):CD011890 — https://doi.org/10.1002/14651858.CD011890.pub3
Viderman D, Nabidollayeva F, Aubakirova M, et al. The Impact of Transcutaneous Electrical Nerve Stimulation (TENS) on Acute Pain and Other Postoperative Outcomes: A Systematic Review with Meta-Analysis. J Clin Med 2024;13(2):427 — https://doi.org/10.3390/jcm13020427
Qaseem A, Wilt TJ, McLean RM, Forciea MA. Noninvasive Treatments for Acute, Subacute, and Chronic Low Back Pain: A Clinical Practice Guideline From the American College of Physicians. Ann Intern Med 2017;166(7):514–530 — https://doi.org/10.7326/M16-2367
Transcutaneous Electrical Nerve Stimulation and Pain-related Quantitative Sensory Tests in Chronic Musculoskeletal Pain: A Systematic Review and Meta-analysis. J Pain 2023 — https://www.jpain.org/article/S1526-5900(23)00378-4/fulltext

Your care team

Clinicians who treat this.

Every clinician at Remix Medical is board-certified and owns the practice — so the physician in your exam room is the one making decisions about your care.

Raju Mantena, DO
Pain Medicine Physician
4.8 · 118 Google reviews
Accepting New Patients
Alham Samani, DC
Doctor of Chiropractic
4.9 · 123 Google reviews
Accepting New Patients

SpecialtyChiropractic MedicineTypeTherapyBody locationMuscle and peripheral nerve at the site of pain or the targeted muscle groupCPT code97014 (electrical stimulation, unattended); 97032 (electrical stimulation, manual, each 15 min)

Also called ESTIM, TENS, EMS, NMES, FES

This page is for general education and is not a substitute for medical advice. Whether a given procedure is appropriate depends on your individual evaluation. Contact a Remix Medical clinician to discuss your care.

Updated April 7, 2024. Medically reviewed by Alham Samani, DC.