advantages vs risks of using electrotherapy on physiotherapy

Electrotherapy  ·  Safety Guide

Medically reviewed by the CK Physio Clinical Team, Chartered Physiotherapists (HCPC-registered).
Published 26 March 2026  ·  Last reviewed June 2026  ·  7 min read

Electrotherapy is a safe, well-established physiotherapy treatment when it is delivered by qualified practitioners, but it does carry specific contraindications and a few minor risks that every patient should understand before treatment. At CK Physio, our Chartered Physiotherapists screen for all contraindications during your initial assessment, so that electrotherapy treatment is only ever recommended when it is appropriate and safe for your individual circumstances.

Is electrotherapy safe?

Electrotherapy has an excellent safety profile when it is administered by trained, HCPC-registered physiotherapists. The technology is approved for clinical use and recognised by the Chartered Society of Physiotherapy as a legitimate treatment modality. Millions of electrotherapy sessions are delivered safely in UK physiotherapy clinics every year.

The growing adoption of electrotherapy reflects this safety record: physiotherapy and rehabilitation clinics account for 42.6% of the global electrotherapy devices market in 2026 — the largest share of any setting. Clinicians would not build their practice around technology that posed a significant risk to patients. For a fuller picture of what the treatment involves, see our guide to what electrotherapy is and how it works.

That said, like any treatment, electrotherapy carries specific risks and contraindications that must be respected. Understanding them helps you make a confident, informed decision about your care.

What are the side effects of electrotherapy?

Most patients experience no adverse effects at all. When side effects do occur, they are typically mild and short-lived.

Common side effects (mild, temporary)

• ▸ Skin redness at the electrode sites. The most commonly reported effect. Mild redness where the pads meet the skin is normal and usually settles within 30–60 minutes. It is caused by increased blood flow to the area — a sign the treatment is working — not tissue damage.
• ▸ Minor muscle soreness. Similar to post-exercise soreness, some patients feel mild aching in treated muscles for 12–24 hours after electrical muscle stimulation (EMS) or interferential therapy. This reflects muscle activation and is a normal response, particularly in early sessions.
• ▸ A tingling or buzzing sensation. During treatment you will feel a gentle tingling where the electrodes sit. This is the intended therapeutic effect, not a side effect. Your physiotherapist adjusts the intensity so it stays comfortable — electrotherapy should never be painful.

Uncommon side effects (rare)

• ▸ Skin irritation or an allergic reaction. A few patients are sensitive to the adhesive on the electrode pads, causing localised itching or a rash. This is easily managed by switching to hypoallergenic pads. Tell your physiotherapist if you have any known adhesive allergies.
• ▸ Temporary dizziness or fatigue. A small number of patients feel lightheaded immediately after treatment, particularly in early sessions. This usually passes within minutes and becomes less likely as the body adapts.
• ▸ Burns. Extremely rare when treatment is delivered by trained professionals using calibrated equipment. Burns can occur if electrodes are applied to broken skin, if equipment is faulty, or if the parameters are set incorrectly — risks that are virtually eliminated by professional administration.

Are the side effects of IFT different from other electrotherapy?

Interferential therapy (IFT) uses two medium-frequency currents that intersect deep within the tissue, which means most of the current passes comfortably through the surface of the skin. In practice, its side-effect profile is the same as other forms of electrotherapy — mild, temporary and uncommon. The effect patients notice most often is brief skin redness or mild irritation under the pads, usually from the adhesive rather than the current itself, which settles within an hour. A few people feel mildly tired after a session in the early stages of treatment. The same contraindications apply throughout: IFT is not used over a pacemaker, over active cancer, or across the abdomen and lower back in pregnancy. Your physiotherapist screens for all of these before treatment begins.

Who should not have electrotherapy? Contraindications explained

Contraindications are conditions where electrotherapy should not be used, or should only be used with great caution under specialist guidance. Your physiotherapist will screen for all of them during your initial assessment.

Relative contraindications — use with caution

These conditions do not automatically rule out electrotherapy, but they call for careful assessment and modified treatment protocols.

• ▸Pregnancy. Electrotherapy is generally avoided over the abdomen and lower back. However, TENS machines are widely and safely used for labour pain under midwife supervision. Treatment to the extremities is generally considered safe but should follow discussion with your physiotherapist and midwife.
• ▸Epilepsy and seizure disorders. Certain frequencies may, in theory, trigger seizures in susceptible individuals. Treatment can often proceed with modified parameters and close monitoring, but must be discussed with your neurologist first.
• ▸Deep vein thrombosis (DVT). Electrotherapy that stimulates muscle contraction or increases blood flow should not be applied near a known DVT, as it may dislodge the clot. Once the DVT has been treated and cleared, electrotherapy can resume.
• ▸Areas of reduced sensation. Where neuropathy or nerve damage reduces sensation, a patient may not accurately report discomfort, raising the risk of burns. Modified intensity and shorter treatment times are used in these cases.
• ▸Broken skin, wounds or active infection. Electrodes must not be placed over open wounds, infected tissue or broken skin. Adjacent areas can be treated once any infection has cleared.
• ▸Recent radiotherapy. Irradiated tissue may have altered sensitivity and healing capacity. Electrotherapy to recently irradiated areas should only proceed after oncologist clearance.

How to minimise risks during electrotherapy

The vast majority of risks are removed simply by following good practice. Here is how you and your physiotherapist keep treatment as safe as possible.

• ▸Share your full medical history. Tell your physiotherapist about all conditions, medications, implanted devices, allergies and pregnancy status — even if you think they are unrelated. Screening relies on complete information.
• ▸Communicate during treatment. Electrotherapy should feel like a gentle tingling, never sharp pain or burning. If anything feels unexpected, say so straight away so the settings can be adjusted.
• ▸Choose qualified practitioners. Always seek electrotherapy from HCPC-registered, Chartered Physiotherapists using calibrated, professionally maintained equipment. Avoid unregulated practitioners and clinical-grade devices used without guidance.
• ▸Follow home-use instructions carefully. If a portable TENS machine is recommended for home use, follow the guidance on electrode placement, intensity and session length precisely. Do not exceed the recommended times or treat areas your physiotherapist has not approved.
• ▸Report any reactions. If you notice prolonged redness, irritation or unusual pain after a session, contact your physiotherapist before the next one so the parameters can be adjusted.

Frequently asked questions about electrotherapy safety

These are the safety questio

ns our patients ask most often.

Making an informed decision about electrotherapy

Understanding the risks and contraindications helps you make a confident decision about your treatment. The evidence is clear: for the vast majority of patients, electrotherapy is a safe and effective treatment when it is administered by a qualified professional. The benefits of electrotherapy — pain relief, faster healing, muscle preservation and reduced inflammation — significantly outweigh the minor risks for most people.

At CK Physio, your safety is our highest priority. Our HCPC-registered Chartered Physiotherapists carry out thorough contraindication screening before every course of treatment. If electrotherapy is not suitable for your circumstances, we will recommend an alternative from our full range of physiotherapy treatments — including manual therapy, exercise rehabilitation, shockwave therapy and acupuncture.

Our clinic in Hanwell serves patients right across West London, and we also offer home visit appointments for patients who prefer to be treated in their own home. With more than 22 years of experience and thousands of patients treated, CK Physio combines clinical expertise with genuine care for your wellbeing.

References & further reading

1. Chartered Society of Physiotherapy (CSP). Conditions and physiotherapy treatment guidance.
2. Health and Care Professions Council (HCPC). Standards of proficiency: Physiotherapists.
3. National Institute for Health and Care Excellence (NICE). Clinical guidelines and evidence.
4. NHS. Transcutaneous electrical nerve stimulation (TENS).
5. Fortune Business Insights. Electrotherapy Devices Market, 2026–2034 (physiotherapy & rehabilitation clinic market share, 2026).

Disclaimer: This article is for general information only and is not a substitute for personalised medical advice. Always consult a qualified, HCPC-registered physiotherapist or your GP before starting any treatment. Suitability for electrotherapy can only be confirmed through an individual clinical assessment.