Numb fingers at night, a tingling sensation in the thumb, index, and middle fingers, and a hand that feels strange in the morning: Carpal tunnel syndrome is the most common nerve entrapment in humans. The good news is that in its early stages, it can often be managed without surgery. The less positive news: those who wait too long risk damage that even surgery can no longer fully reverse.

This article explains how to recognize carpal tunnel syndrome, what you can do yourself, and at what point surgical intervention really makes sense.

What is carpal tunnel syndrome?

The carpal tunnel is a narrow passageway on the inside of the wrist. The flexor tendons of the fingers and the median nerve (nervus medianus) run through it. The tunnel is bordered below by the carpal bones and above by a strong band of connective tissue, the flexor retinaculum.

This space cannot stretch. If the tissue inside the tunnel swells, pressure increases – and the median nerve is the softest structure within it. It becomes compressed. This is precisely what carpal tunnel syndrome is.

The median nerve supplies the thumb, index finger, middle finger, and the thumb side of the ring finger. Consequently, the symptoms are almost always located there – while the little finger remains unaffected. This pattern is so characteristic that it often already suggests the diagnosis.

The typical symptoms

Hands falling asleep at night. The first and most common sign. Affected individuals wake up because their hand is tingling or aching, and they shake it out. The reason: at night, the wrist is often bent, which increases pressure inside the tunnel.

Tingling and numbness in the thumb, index, and middle fingers. Usually bilateral, and often more pronounced in the dominant hand.

Pain radiating into the forearm. Some affected people describe pain reaching up to the shoulder – which occasionally leads the diagnosis in the wrong direction.

Loss of strength and clumsiness. Glasses slip out of the hand, fastening buttons becomes difficult, and turning a key is harder.

Wasting of the ball of the thumb. A late sign. The muscle bulk under the thumb becomes flatter. You should not wait for this stage to occur.

Self-test: Indications of carpal tunnel syndrome

Three simple tests can provide an initial indication. They do not replace a medical diagnosis, but they help with assessment.

The bottle sign test. Can you fully grasp a bottle with your thumb and index finger without leaving a gap? If this is no longer possible, the muscles of the ball of the thumb may already be weakened.

Phalen's maneuver (flexion test). Hold the backs of both hands together in front of your chest so that your wrists are maximally bent. Hold this position for one minute. If tingling or numbness occurs in the thumb, index, and middle fingers during this time, it is a clear indication.

Hoffmann-Tinel percussion sign. Lightly tap with your finger on the inside of your wrist. A shooting, electric-like sensation in the fingers suggests irritation of the median nerve.

Important: A negative self-test does not rule out carpal tunnel syndrome, and a positive one does not prove it. Confirmation is achieved by measuring nerve conduction velocity.

Which doctor treats carpal tunnel syndrome?

The first point of contact is usually your family doctor. Neurology is responsible for confirming the diagnosis – this is where nerve conduction velocity is measured. This test objectively shows how severely the nerve is impaired and provides the basis for deciding on surgery.

For the treatment itself, hand surgery, plastic surgery, orthopedics, and neurosurgery are options. The key factor is less the specialist title and more the experience with this specific procedure.

What you can do yourself

In the early stages – where symptoms occur mainly at night, with no permanent numbness and no muscle weakness – a lot can often be achieved without surgery.

The night splint

The most effective conservative measure. A wrist splint keeps the joint in a neutral position at night and prevents the bending that increases pressure in the tunnel. It should be worn consistently over several weeks.

What to look out for: The splint must stabilize the wrist, not the fingers. It should sit straight, not hyperextended. And it must be comfortable enough at night to actually keep it on – a splint that ends up in bed at two in the morning is ineffective.

Nerve gliding exercises

These exercises are designed to improve the mobility of the nerve within the tunnel. They should be performed slowly and without pain, several times a day, with five to ten repetitions each.

1. Fist to open hand. Gently clench your hand into a loose fist, thumb on the outside. Slowly open it until all fingers are extended. Repeat.

2. Wrist extension. Extend your arm forward, palm facing down. Gently pull your fingers upward with the other hand until you feel a light stretch in your forearm. Hold for 15 to 20 seconds.

3. Thumb stretch. Extend your arm, palm facing up. Gently pull your thumb downward and outward. Hold for 15 to 20 seconds.

4. Nerve glide. Extend your arm to the side, palm forward, fingers pointing up. Slowly tilt your head to the opposite side. You should feel a slight tension – not pain. Hold briefly, then release.

5. Tendon gliding. Fingers straight, then to a claw position, then into a fist, then open again. Do this slowly, in clearly separated positions.

A note: Exercises help in the early stages. If permanent numbness or loss of strength is already present, they do not replace a medical assessment – doing so would lose valuable time.

Other measures

Adapt strain wherever possible: Vibrating tools, constantly bent wrists at a keyboard, and forceful gripping actions increase pressure. Anti-inflammatory medication or a targeted injection can temporarily relieve symptoms – but they do not eliminate the narrowness.

Carpal tunnel syndrome during pregnancy

Carpal tunnel syndrome frequently occurs during pregnancy, most commonly in the last trimester. The cause is increased water retention in the tissue, which increases pressure in the tunnel.

The important message: In most cases, this form resolves on its own after birth. Therefore, treatment is usually conservative, using a night splint. Surgery is only performed in exceptional cases.

When surgery makes sense

The decision is not based on the level of suffering alone, but on the condition of the nerve. Factors in favor of surgery include:

• Persistent numbness that no longer occurs only at night

• Loss of strength or visible wasting of the thumb muscles

• Significantly delayed nerve conduction velocity in the neurological test

• Conservative treatment for several weeks without sufficient improvement

The crucial point: A nerve that is under pressure for a long time suffers permanent damage. If surgery is performed too late, the nighttime pain usually disappears reliably – but the numbness and loss of strength may no longer fully recover. This is the reason why waiting is not a safe option in advanced cases.

How the surgery works

The procedure is one of the most common in hand surgery. The goal is simple: the band over the carpal tunnel is cut, thereby widening the tunnel and relieving pressure on the nerve. The nerve itself is not touched. You can find an overview of our approach on the page about carpal tunnel syndrome.

The operation is usually performed on an outpatient basis under local anesthesia. The procedure typically takes 15 to 30 minutes. You can go home on the same day afterward.

There are two approaches: the open technique via a small incision in the palm, and the endoscopic technique via a shorter entry point with a camera. Both cut the same band. Which technique is suitable depends on the findings – such as whether it is a primary surgery and what the anatomical conditions are.

After the surgery

The first few days. The hand is bandaged and should be kept elevated. Fingers can and should be moved from the very beginning – this prevents tissue adhesions. Pain is usually highly manageable.

Sutures. These are typically removed after about 10 to 14 days.

How long off work? This highly depends on your profession. For predominantly sedentary work without heavy gripping, many people are ready to work again after 1 to 2 weeks. For physically demanding work, especially with tools or heavy lifting, it takes significantly longer – here, 4 to 6 weeks is realistic.

Strain. The most common mistake after carpal tunnel surgery is returning to full strain too early. The scar in the palm remains sensitive to pressure for weeks, and the cut ligament needs time. Gripping heavily too soon risks delayed healing and persistent discomfort in the scar area. Adhere to the clearance given after your follow-up check, even if the hand feels good earlier.

When do the symptoms disappear? Hands falling asleep at night often improves within the very first nights. Numbness and strength take longer – depending on how long the nerve was under pressure, this can take weeks to months.

Possible risks

The procedure is considered low-risk, but like any surgery, it is not risk-free. Possible complications include post-operative bleeding, wound healing disorders, and infections, a scar sensitive to pressure for several weeks, temporary reduction in grip strength, and in rare cases, injuries to nerve or vascular structures. Rarely, symptoms persist or return.

We will discuss your individual risk profile and whether the procedure is the right path for you in a personal consultation.

Consultation at the FORUM Clinic

If your hand falls asleep at night, your fingers remain numb, or you are unsure whether exercises and a splint are still sufficient for you: we will look at the findings and tell you honestly what makes sense – even if that means surgery is not yet necessary. Feel free to schedule a personal consultation.

Frequently Asked Questions

Can carpal tunnel syndrome go away on its own?

During pregnancy, yes – it usually resolves on its own after birth. Outside of pregnancy, spontaneous recovery is rather the exception. However, early symptoms can often be well managed with a night splint and exercises.

At what measurement value is surgery performed?

There is no single threshold value at which surgery is automatically performed. Nerve conduction velocity is an important component, but it is always evaluated together with the symptoms and clinical findings. A significantly delayed conduction velocity combined with persistent numbness or loss of strength clearly suggests surgery.

How long are you signed off work after carpal tunnel surgery?

For predominantly desk-based work, usually 1 to 2 weeks; for physically demanding work, significantly longer, often 4 to 6 weeks. The decisive factor is not the date, but the load-bearing capacity of the hand.

What happens if I apply strain too early?

The scar in the palm will remain sensitive to pressure for longer, healing is delayed, and symptoms can persist for a longer period. The success of the procedure itself is generally not undone by this, but the recovery process will take longer.

Can carpal tunnel syndrome return after surgery?

It is rare, but possible. If symptoms reoccur after a symptom-free period, this should be investigated – scarring, incomplete division of the ligament, or another cause may be behind it.

Does taping help with carpal tunnel syndrome?

Kinesiology tape can serve as a short-term reminder to keep the hand in a gentle position and is found pleasant by some. However, it does not widen the tunnel and is not a substitute for a splint or medical assessment.