Carpal tunnel syndrome: what causes the tingling, what helps and when surgery makes sense

Carpal tunnel syndrome happens when the median nerve is squeezed where it passes through a narrow tunnel in the wrist. The classic signs are numbness, tingling or pins and needles in the hand, a weak thumb or trouble gripping. Symptoms often start slowly, come and go, and are usually worse at night [3].

How common is it?

In a Swedish study of 2,466 adults, hand tingling or numbness in the area served by the median nerve was common, but true carpal tunnel syndrome was much less so:

• Tingling, numbness or pain in the median nerve area14.4%
• Nerve damage at the wrist on nerve testing4.9%
• Clinically certain carpal tunnel syndrome3.8%
• Confirmed by both exam and nerve testing2.7%

Source: Atroshi et al., JAMA, 1999 [1]. Adults aged 25 to 74 in southern Sweden.

In other words, about 1 in 5 people with these hand symptoms turned out to have carpal tunnel syndrome [1]. It is most common between 30 and 60 and more common in women [2].

What raises the risk

• Forceful, repetitive or vibrating work: a review of 37 studies found that hand force, repetition and vibrating tools were each linked to roughly double the risk [4]. That is an association, and the studies varied a lot.
• Typing and the mouse: the evidence does not show that ordinary keyboard use causes it. The orthopedic surgeons’ guideline states, as expert consensus, that there is no association with high keyboard use [6]. One review suggested heavy computer use, especially the mouse, might be a minor risk factor among office workers [5].
• Diabetes: linked to about a 70% higher risk after accounting for other factors [7].
• Pregnancy: it is common in pregnancy, and although it often settles [3], symptoms persisted more than a year after delivery in over half of cases in one review [8].
• Other factors include being overweight, arthritis, a family history and a previous wrist injury [3].

How it is diagnosed

The diagnosis is often made from your symptoms and an exam. The 2024 guideline from the orthopedic and hand surgery societies says a standard clinical checklist can be used instead of routine ultrasound or nerve testing [6]. Nerve tests remain useful when the picture is unclear.

What helps

Here is what the better trials and reviews show:

Treatment	What the evidence shows
Night splint	Little or no benefit on average symptom scores in the short term, though one trial of 80 people found more overall improvement with a night splint than with no treatment [9]
Steroid injection	Better symptoms than a placebo for up to 3 to 6 months [10]. Better than a night splint at 6 weeks, but no difference by 6 months [12]
Manual therapy and exercise	In trials of women in Spain, a few sessions of manual therapy did as well as surgery at 1 and 4 years [14] [15]
Surgery	More overall improvement than a splint over the long term, but the extra gain in symptom scores was smaller than what patients usually notice [13]
Oral anti-inflammatories, diuretics, supplements, magnets, heat	No better than placebo or control, according to the orthopedic guideline [6]

A few details worth knowing:

• Splints are cheap and low risk, which is why they are still a reasonable first step. The NHS notes you may need to wear one at night for up to 6 weeks before you feel a difference [3].
• Injections help, but often not for good. In one trial of people whose splints had not worked, 3 out of 4 had surgery within a year even after an injection [11]. The orthopedic guideline says steroid injections do not give long-term improvement [6].
• Hand therapy evidence is mixed. The manual therapy trials came from one research group and included only women [14] [15], while the orthopedic guideline rates the long-term evidence for exercise and manual therapy as limited [6]. Nerve gliding exercises and activity changes are commonly recommended as part of care [16].
• Surgery usually works. The NHS says surgery usually cures carpal tunnel syndrome, and it takes about a month to get back to normal activities [3]. Grip and pinch strength usually return about 2 to 3 months after surgery, though full recovery can take up to a year [16]. If your symptoms are tolerable, starting with non-surgical care and having surgery later if needed is a reasonable path [13].

When not to wait

See a doctor promptly if numbness is constant, your fingers keep losing feeling, you are dropping things, or the muscle at the base of the thumb is wasting away [2]. In long-standing cases with constant numbness and thumb muscle wasting, surgery may be recommended to prevent permanent damage [16].

Get emergency care if numbness and pain in the hand come on and get rapidly worse after a wrist injury or fracture. Acute carpal tunnel syndrome after trauma is a surgical emergency [17].

Call 911 for sudden numbness or weakness in the face, arm or leg, especially on one side of the body. That is a stroke warning sign, not carpal tunnel syndrome [18].

The takeaway

• Carpal tunnel syndrome causes numbness and tingling in the hand, often worse at night.
• Forceful, repetitive and vibrating work are linked to it. Ordinary typing has not been shown to cause it.
• Splints are a low-cost first step, and steroid injections give relief for a few months.
• Surgery usually works and is the best option for constant numbness or muscle wasting.
• Sudden one-sided numbness is a stroke warning: call 911.

You can start physical therapy in Utah without a referral. If your hands go numb at night or at work, an evaluation can check whether it is carpal tunnel syndrome or something else, and coordinate with your doctor if you need nerve testing or a surgical opinion.