Carpal Tunnel Syndrome

What is Carpal Tunnel Syndrome?

Carpal tunnel syndrome is a condition in which the median nerve is squeezed as it passes through the carpal tunnel, a narrow channel at the wrist. It is the most common entrapment neuropathy, and rising pressure inside the tunnel is the main factor behind it.^{[1, 2]}

Common symptoms

Early symptoms are pain, numbness and tingling in the thumb, index finger, middle finger and half of the ring finger. Symptoms usually start at night and ease during the day, then appear during activities such as typing or drawing. Pain can spread to the forearm, and in advanced cases there may be hand weakness, clumsiness and wasting of the muscle at the base of the thumb.^[1]

Causes and risk factors

Repetitive hand movements and vibrating tools raise the risk. So do obesity, diabetes, rheumatoid arthritis, an underactive thyroid, pregnancy and a family tendency.^[1] The causes are multi-factorial and not fully understood, and some people may have an underlying nerve vulnerability that makes them more susceptible.^[3]

How it is diagnosed and treated conventionally

Diagnosis rests on your history and a physical examination, including tests such as the Phalen maneuver. Ultrasound or nerve conduction studies help in unclear cases or before surgery.^[4]

Mild to moderate cases are usually treated first without surgery, with splinting, corticosteroid injection, physical therapy and therapeutic ultrasound. Surgical decompression is offered when the condition is severe or does not improve after four to six months of conservative care.^[4] Both surgical and non-surgical treatments are beneficial, and clinicians can choose among several options for each person.^[2]

Why Carpal Tunnel Syndrome calls for a whole-person approach

Carpal tunnel syndrome is not only a wrist problem. Pressure in the tunnel is influenced by work and hand use, by body weight and by other medical conditions, and symptoms depend on how the nerve and the brain respond to that pressure.^{[1, 3]}

Care that looks at several of these factors at once is a reasonable addition to wrist-directed treatment. The sections below describe the factors most relevant to this condition.

Repetitive use and workplace load

Repetitive movements and vibrating equipment are recognized risk factors.^[1] Reviewing how you use your hands, and taking rest breaks, is a standard part of conservative care.^[4]

Other medical conditions

Diabetes, rheumatoid arthritis, an underactive thyroid, obesity and pregnancy all contribute to risk.^[1] These need to be managed by your physician, and they are a reason to share your full health history with us.

Changes in how the brain processes hand sensation

Imaging research shows that carpal tunnel syndrome is linked to altered connectivity between the brain's primary sensory area for the hand and other brain regions.^[5] In a small imaging study, these changes were associated with function and nerve health. This is early research and does not by itself change treatment.

Psychological well-being

A major review suggests that treatment should be judged more broadly than surgery alone, including psychological well-being and quality of life.^[3]

Acupuncture for Carpal Tunnel Syndrome

What the research shows

The evidence for acupuncture in carpal tunnel syndrome is limited. Trials are small, many have a high risk of bias, and the results depend on what acupuncture is compared with.

A 2018 Cochrane review of 12 studies (869 participants) concluded that acupuncture and laser acupuncture may have little or no short-term effect on symptoms compared with sham treatment. Compared with steroids, vitamin B12, ibuprofen or splints, the certainty of the evidence was low or very low.^[6] A small sham-controlled trial of 41 people with mild to moderate symptoms, all wearing night braces, found improvement in both real and sham groups and no clear advantage for real acupuncture.^[7]

Some results are more encouraging. In a trial of 181 adults who all wore night splints, 13 sessions of electroacupuncture over 17 weeks produced small improvements in symptoms, function and pinch strength compared with splinting alone. The authors considered the pain difference clinically unimportant.^[8] A 2023 review of 16 trials (1,025 people) concluded that acupuncture may help as an add-on treatment, but rated the evidence as low or very low certainty.^[9] An earlier review of 10 trials reported better results than ibuprofen and, with splinting, than splinting alone, but most trials were at high risk of bias.^[10]

A trial of 40 people found that adding acupuncture to physiotherapy gave greater short-term improvement in pain and disability than physiotherapy alone, which the authors called preliminary.^[11] A sham-controlled trial of laser acupuncture in 84 people found a greater drop in symptom scores over four weeks, though nerve conduction tests did not differ between groups.^[12]

How acupuncture may work

Researchers suggest that acupuncture may act partly through the nervous system. In a brain imaging study of people with carpal tunnel syndrome, 8 weeks of electroacupuncture was linked to changes in how the sensory area for the hand connects to other brain regions, and these changes tracked with better function and nerve conduction.^[5] This was a small study, and it does not show that acupuncture works better than sham treatment.

What treatment involves

Treatment uses fine, sterile, single-use needles placed at points on the hand, forearm and sometimes elsewhere, usually left in place for about 20 to 40 minutes. Trials have used from 6 weekly sessions to 13 sessions over 17 weeks.^{[7, 8]} We reassess after a short course of visits.

Serious problems are rare. In prospective studies, about 9 in 100 patients had a minor reaction such as bleeding, soreness or redness at a needle site, and serious events occurred in about 1 in 10,000 patients.^[13] Studies in carpal tunnel syndrome reported bruising and local pain at needle sites.^[6] Tell the practitioner first if you have a bleeding disorder, take blood thinners, are pregnant, or have a pacemaker (relevant to electroacupuncture).

Ayurvedic medicine for Carpal Tunnel Syndrome

The Ayurvedic view

Ayurveda has no exact equivalent of carpal tunnel syndrome. Tingling, numbness and pain in the hand and arm are generally understood as signs of disturbed Vata, the principle said to govern movement and the nerves. This is a traditional framework for choosing treatment, not a biomedical diagnosis.

Therapies that may be used

Care is chosen for the individual and traditionally combines:

• Diet and daily routine intended to calm Vata, such as warm, regular meals and steady sleep hours
• Warm herbal oil massage of the hands, forearms and shoulders
• Herbs used traditionally for nerve and joint comfort, prescribed individually
• A herbal preparation applied to the skin, which is part of our transdermal medication therapy

Panchakarma procedures are not appropriate during pregnancy, acute illness or frailty, and are not a first step for hand symptoms. We would only consider them when they are medically sensible and your physician is aware.

What the research shows

We found no research on Ayurveda as a system of care for carpal tunnel syndrome. A PubMed search found no systematic reviews and no clinical trials of Ayurvedic treatment, Panchakarma or Ayurvedic oil therapy for this condition.

Two placebo-controlled trials, one of topical turmeric (curcumin) gel^[14] and one of chamomile oil,^[15] are described under herbal medicine below. They were not designed as tests of Ayurveda as a system, so they do not show that Ayurvedic care works for carpal tunnel syndrome.

Herbal medicine for Carpal Tunnel Syndrome

Herbs and formulas that have been studied

Most carpal tunnel research on herbs covers preparations applied to the skin. Topical turmeric (curcumin) gel and topical chamomile oil have each been tested in placebo-controlled trials, both together with a night splint.^{[14, 15]} A broader review of plant-derived medicines for nerve disorders included carpal tunnel syndrome among the conditions studied.^[16]

What the research shows

The evidence is limited, and it comes from a handful of small trials. In 70 people, curcumin gel plus a splint improved symptom and function scores more than placebo gel plus a splint over 8 weeks, but nerve conduction tests did not change.^[14] In 86 people, topical chamomile oil plus a splint improved symptom, function and grip scores more than placebo over 4 weeks, with a small change in one nerve test.^[15]

A review of plant medicines for neuropathy found that curcumin and chamomile each had only one clinical trial in neuropathy, and it called for more studies to confirm safety and benefit.^[16] We found no systematic review of Chinese herbal formulas taken by mouth for carpal tunnel syndrome.

Safety and herb-drug interactions

Herbs are active substances and can interact with medicines. Case reports describe bleeding when warfarin was combined with several herbs, including dan shen, dang gui, ginger and chamomile.^[17] Serious interactions have also been described with antidepressants, immunosuppressants and other drugs.^[18] People taking blood thinners need a practitioner's review before using herbs, including skin products.

Herbal and dietary supplements are a recognized cause of liver injury.^[19] In one study, about one fifth of Ayurvedic products bought online contained detectable lead, mercury or arsenic.^[20] Herbs should come from tested sources and be prescribed individually. Tell us if you are pregnant or breastfeeding, have liver or kidney disease, take diabetes or thyroid medicines, or have surgery planned.

Translating traditional medicine into modern biological language

The links drawn here are interpretation, not equivalence. Chinese medicine describes pain and numbness in the hand as blocked flow of qi and blood in the channels of the arm. Researchers studying acupuncture in carpal tunnel syndrome look at things that loosely parallel this picture, such as nerve function and how the brain's sensory areas respond.^[5]

Ayurveda's disturbed Vata describes numbness, tingling and loss of smooth movement. No study has shown that a dosha or a channel corresponds to a specific biological process.

How this care fits with your medical care

Integrative care for carpal tunnel syndrome is complementary. Keep your physician, hand specialist or physical therapist, and do not stop or change prescribed medicines, splinting or planned injections or surgery without your treating team. We do not diagnose the cause of hand numbness, so new or worsening symptoms should be medically evaluated.

Please bring your diagnosis, any nerve conduction or ultrasound reports, a full list of medicines and supplements, and details of any injections or surgery, planned or past. Because diabetes, thyroid disease and pregnancy can contribute, tell us about them.^[1]

When to seek urgent medical care

Some hand symptoms point to a more serious problem or to nerve damage that is progressing.^[1]

• Constant numbness, or weakness or wasting at the base of the thumb
• Loss of grip or dropping objects that is getting worse
• Hand symptoms together with neck pain, or numbness spreading into the arm or both sides
• A hot, red, swollen wrist or hand, or symptoms after an injury
• Sudden weakness, facial droop, trouble speaking or confusion

If any of the last symptoms occur, call 911 or go to the nearest emergency department.