Carpal Tunnel Surgery: A Guide to the problem and the solutions.
Waking up at night with numb, tingling or painful hands — and shaking them out to get the feeling back — is one of the most recognisable presentations of carpal tunnel syndrome. It is a common condition and one that can be treated effectively with non-surgical techniques and, if needed, a procedure under local anaesthetic.
Carpal tunnel syndrome (CTS) is caused by pressure on the median nerve as it passes through a narrow channel in the wrist called the carpal tunnel. The median nerve is responsible for feeling in the thumb, index, middle and part of the ring finger, and for some of the small muscles that control the thumb. When the tunnel becomes too tight, those functions are affected.
This guide explains what causes carpal tunnel syndrome, how it is diagnosed, what each treatment option involves and what to expect from surgery and recovery. I see patients with CTS frequently at my clinics in Hertfordshire and London, and it is one of the most reliably treatable conditions in hand surgery.
In short: Carpal tunnel syndrome is confirmed by symptoms and, where needed, by a nerve conduction study. Many patients improve with a nocturnal wrist splint or a corticosteroid injection into the wrist. When these measures have not provided lasting relief — or when the nerve compression is causing weakness or persistent numbness — a short day-case operation to release the carpal tunnel reliably resolves symptoms in the large majority of patients. The operation takes around 20 minutes, and most patients return to desk work within one to two weeks.
What is carpal tunnel syndrome?
Carpal tunnel syndrome develops when the median nerve — one of the main nerves supplying the hand — is compressed within the carpal tunnel at the wrist. The carpal tunnel is a narrow passageway formed by the small wrist bones on three sides and a tough fibrous band called the transverse carpal ligament on the fourth. The median nerve and the flexor tendons of the fingers all pass through this tunnel. When the space inside the tunnel becomes reduced, the nerve is squeezed, and its ability to conduct normal signals is affected.
The condition is one of the most common reasons patients are referred to a hand surgeon. It is more common in women and becomes more prevalent with age, though it can affect anyone.
What causes carpal tunnel syndrome?
Carpal tunnel syndrome is often not caused by a single identifiable factor. It is more likely to develop in people who:
are female or are aged over 40,
have diabetes, an underactive thyroid (hypothyroidism) or rheumatoid arthritis,
are pregnant — fluid retention during pregnancy can temporarily narrow the tunnel,
are overweight,
do work or activities that involve prolonged wrist bending, gripping or use of vibrating tools,
have had a previous wrist fracture or injury,
or have a close family member with the condition.
In many patients, several of these factors overlap. Identifying and addressing any reversible contributing factors — such as poorly controlled diabetes or hypothyroidism — is worth doing alongside treatment.
What are the symptoms of carpal tunnel syndrome?
The most common symptoms of carpal tunnel syndrome are tingling, numbness and aching in the thumb, index and middle fingers, and in the palm and wrist. These symptoms are typically worse at night and may be severe enough to wake patients from sleep. Shaking the hand or hanging it over the side of the bed often provides temporary relief.
Other symptoms include:
pain that radiates up the forearm towards the elbow,
stiffness and clumsiness in the fingers, particularly in the morning,
weakness in pinch grip — difficulty with precise tasks such as fastening buttons or turning a small key,
and — in more advanced cases — wasting of the pad of muscle at the base of the thumb.
Symptoms are often worse during activities that involve holding the wrist in a bent or extended position (driving, reading, typing or holding a phone) and may ease with rest.
How is carpal tunnel syndrome diagnosed?
Carpal tunnel syndrome is usually diagnosed clinically — from the pattern of symptoms and a physical examination of the hand and wrist. Most patients do not need imaging or additional tests to make the diagnosis.
A nerve conduction study (NCS) measures the speed at which electrical signals travel through the median nerve. The NHS and clinical guidelines note that a nerve conduction study is not always required but is useful in cases where the diagnosis is uncertain, where symptoms are atypical or where it is helpful to document the severity of nerve compression before surgery. The study is painless, involves small electrical impulses applied to the skin, and takes around 30 minutes.
Ultrasound of the wrist can also be used to visualise the median nerve directly and confirm the diagnosis where there is doubt.
What non-surgical treatments are available for carpal tunnel syndrome?
Wrist splinting. A neutral wrist splint worn at night keeps the wrist in a straight position, reducing the pressure on the median nerve during sleep — the period when symptoms are typically worst. Nocturnal splinting is the first-line treatment for mild to moderate carpal tunnel syndrome and can provide good relief, particularly in patients whose symptoms are predominantly at night. The NHS recommends wearing the splint for up to six weeks before assessing whether it is helping. Splints are available from pharmacies and online without prescription.
Corticosteroid injection. A corticosteroid injection delivered into the carpal tunnel reduces inflammation and swelling within the tunnel, temporarily decreasing pressure on the nerve. An injection can provide effective relief for several months and is a reasonable option for patients who want to avoid surgery, or for whom surgery is not suitable at present (for example during pregnancy). The injection may need to be repeated if symptoms recur, though repeated injections carry a small risk of tendon injury over time.
Hand therapy and activity modification. Reducing or modifying activities that aggravate symptoms can help in mild cases. A hand therapist can advise on wrist position, workplace ergonomics and specific exercises, though exercise alone has limited evidence as a primary treatment for established CTS.
When is surgery recommended for carpal tunnel syndrome?
Surgery is the appropriate next step when:
symptoms have not adequately improved with splinting and injections,
symptoms are severe, persistent or significantly affecting daily life,
there is weakness or wasting of the thumb muscles suggesting the nerve compression is advanced,
or nerve conduction studies show significant impairment of the median nerve.
The decision is reached together with the patient. Some people manage well with periodic injections and prefer to avoid surgery; others have clear nerve compression or progression and benefit from early surgical referral. Treatment is matched to the individual's circumstances — the severity of their symptoms, their occupation, their preferences and any relevant medical factors.
What does carpal tunnel decompression surgery involve?
Carpal tunnel decompression is the operation that relieves pressure on the median nerve by cutting the transverse carpal ligament — the tight roof of the carpal tunnel — to give the nerve more space.
The anaesthetic. The vast majority of carpal tunnel operations are performed under a local anaesthetic, with the patient awake and the hand numb from an injection at the wrist. This approach — sometimes referred to as wide-awake surgery — is safe and comfortable for the majority of patients, avoids the risks associated with deeper anaesthesia and allows patients to go home almost immediately after the procedure. For patients who prefer not to be awake, the operation can be performed under sedation & regional anaesthetic, or general anaesthetic.
The operation. A small incision — typically 2 to 4 cm — is made in the palm at the base of the hand. The transverse carpal ligament is divided under direct vision, opening the roof of the carpal tunnel. Once the ligament is fully released, the nerve has more room to function without pressure. The wound is closed with a few stitches and a dressing is applied. The operation takes around 20 minutes.
Immediately after surgery. Patients go home the same day. The fingers can be moved straight away — and doing so is encouraged. Most patients notice that their night symptoms begin to ease within the first few days as the nerve recovers.
What is the recovery from carpal tunnel surgery?
Recovery from carpal tunnel decompression follows a broadly predictable pattern, though the timeline varies between patients depending on how long the nerve was compressed before surgery, age and general health.
The first two weeks. The wound should be kept clean and dry until the stitches are removed at around 10 to 14 days. A bulky dressing is worn initially and can usually be reduced to a small plaster within a few days. Light finger use is encouraged from day one; repetitive heavy grip should be avoided until the wound has healed.
Return to driving. Most patients are able to drive again at around two weeks — once the wound is comfortable and they can grip and release the steering wheel safely without hesitation. Your surgeon will advise based on your individual recovery.
Return to work. Patients in desk-based or administrative roles typically return to work within one to two weeks. Those in physically demanding roles — involving repeated heavy gripping, vibrating tools or manual lifting — generally need four to six weeks before the hand is strong and comfortable enough.
Nerve recovery. Night tingling and pain often begin to improve within the first few days to weeks after surgery. Feeling in the fingers typically recovers over several weeks to months. Full strength in the hand and a fully comfortable scar generally take around three to six months. In patients who had advanced nerve compression before surgery — with significant numbness or muscle wasting — full recovery can take longer and may not be complete.
Pillar pain. A proportion of patients experience temporary aching around the base of the palm (sometimes called pillar pain) in the weeks after surgery. This relates to the healing of the soft tissues around the divided ligament and usually resolves between three and six months. Hand therapy exercises can help.
My approach to carpal tunnel syndrome
Carpal tunnel syndrome is the most common condition I see in clinic, and for the majority of patients it can be managed very effectively. The starting point is always a careful assessment — confirming the diagnosis, understanding how the symptoms are affecting the patient's life and identifying any contributing factors. A number of other conditions can mimic carpal tunnel syndrome, including cervical nerve root compression and other peripheral nerve problems, and it is important to be confident in the diagnosis before proceeding with treatment.
For patients with mild or intermittent symptoms, I usually suggest starting with a nocturnal splint and giving it six weeks; for those with more moderate symptoms a corticosteroid injection is often the appropriate first step. For patients with more significant or progressive symptoms, weakness or nerve conduction evidence of moderate to severe compression, the case for surgery is stronger and I discuss it early.
Carpal tunnel decompression is a reliable operation. In my experience, patients with typical CTS and a straightforward nerve conduction study are very likely to see meaningful improvement, particularly in their night symptoms, within days of the procedure.
I see patients at Spire Bushey Hospital in Hertfordshire, One Hatfield Hospital and Pinehill Hospital in Hitchin. If you would like to discuss your symptoms, you are welcome to book a consultation.
What are the risks of carpal tunnel surgery?
Carpal tunnel decompression is a low-risk procedure, but as with any operation, complications can occur.
Infection. Wound infection is uncommon, occurring in around 1–2% of cases, and is almost always treated successfully with antibiotics.
Scar tenderness and pillar pain. Tenderness around the incision scar or at the base of the palm (pillar pain) is common in the weeks after surgery and usually settles within two to three months.
Incomplete relief of symptoms. In a small proportion of patients, symptoms do not fully resolve after surgery. This is more likely when nerve compression was severe or longstanding before the operation.
Recurrence. Carpal tunnel syndrome can recur after surgery, though this is uncommon. A revision decompression can be performed if needed.
Nerve or vessel injury. The small digital nerves and blood vessels are close to the operative field. Injury to these structures is rare with careful technique, but it is a recognised risk.
Stiffness. Temporary stiffness in the wrist or fingers can occur and is addressed with hand therapy exercises.
Frequently asked questions about carpal tunnel surgery
How long does carpal tunnel surgery take? The operation takes approximately 20 minutes. It is performed as a day case, so patients go home the same day without an overnight stay.
Is carpal tunnel surgery done under general anaesthetic? The vast majority of carpal tunnel operations are performed under local anaesthetic alone, with the hand numb and the patient awake. This is safe and comfortable for the majority of patients. Sedation & regional anaesthetic, or general anaesthetic, is available for patients who prefer a deeper level of anaesthesia.
How long does recovery from carpal tunnel surgery take? Night tingling often begins to improve within days of surgery. The wound heals within two to three weeks. Full hand strength and a comfortable scar typically take three to six months to achieve. Return to desk work is usually possible within one to two weeks.
When can I drive after carpal tunnel surgery? Most patients can drive again at around two weeks after surgery, once the wound is comfortable and they can grip the steering wheel safely.
How successful is carpal tunnel surgery? Carpal tunnel decompression has a high success rate. Published data consistently show that the large majority of patients with typical CTS experience significant improvement in their symptoms following surgery, particularly in night pain and tingling.
Can carpal tunnel syndrome come back after surgery? Recurrence after carpal tunnel decompression is uncommon. When symptoms return, revision surgery can be performed, though it carries a slightly higher complication risk than the initial procedure.
Do I need a nerve conduction study before surgery? For uncomplicated carpal tunnel syndrome with a clear clinical picture, a nerve conduction study is not always required and surgery can be discussed without one. Where the diagnosis is uncertain, symptoms are atypical or it is helpful to document the degree of nerve damage before operating, a nerve conduction study is useful additional information.
Can carpal tunnel syndrome get better without surgery? Mild carpal tunnel syndrome can improve without surgery, particularly in pregnancy where it often resolves after delivery. A nocturnal splint and a corticosteroid injection are worth trying first. For patients with progressive symptoms, weakness or significant nerve conduction changes, surgery provides more reliable and lasting relief than non-surgical measures alone.
About the author
Mr Gavin Schaller FRCS(Tr&Orth) — Consultant Hand & Wrist Surgeon The Schaller Hand & Wrist Clinic, Hertfordshire & London
This article is for general information only and does not constitute medical advice. If you are concerned about symptoms in your hand or wrist, please seek assessment from a qualified medical professional.
