Carpal tunnel syndrome

What is carpal tunnel syndrome?

Carpal tunnel syndrome (CTS) occurs when the median nerve is compressed as it passes through the carpal tunnel, a narrow passageway in the wrist formed by bones and ligaments. The median nerve controls sensation in the thumb, index, middle, and part of the ring finger, as well as the muscles that move the thumb.

When the tissues surrounding the tunnel become inflamed, swollen, or thickened, pressure builds on the nerve. This disrupts the nerve signals travelling between the hand and the brain, causing the characteristic symptoms of numbness, tingling, and weakness.

Importantly, CTS is not always caused by what happens at the wrist alone. Systemic conditions, including diabetes, thyroid dysfunction, and chronic inflammation, can make nerves more vulnerable to compression and slow their recovery.

Symptoms of carpal tunnel syndrome

Symptoms typically begin gradually and may come and go before becoming persistent. Common signs include:

• Numbness or tingling: this is most common in the thumb, index, and middle fingers.

• Nighttime discomfort: many people feel the need to "shake out" their hands upon waking.

• Weakness: you might drop objects or find it harder to button a shirt.

• Sensations of shock: some describe occasional electric-shock sensations in the fingers.

• Pain or aching that can radiate up the forearm toward the elbow.

Symptoms tend to worsen with activities that involve sustained wrist flexion, such as driving, using a keyboard, or holding a phone, and often improve temporarily with rest or shaking the hand.

Consistent monitoring helps you understand if these are fleeting moments or a pattern. That is why testing is so important, as it brings clarity to what is happening beneath the surface.

What causes carpal tunnel syndrome?

There is rarely a single cause for this condition. Instead, what causes carpal tunnel syndrome is often a combination of risk factors that increase pressure on the median nerve.

Key contributing factors include:

• Anatomy: some people have a naturally narrower carpal tunnel, making them more susceptible regardless of lifestyle.

• Repetitive motion: frequent wrist flexion or prolonged use of vibrating tools can irritate the tendons running through the tunnel, causing them to swell.

• Systemic health: conditions like diabetes, thyroid imbalance such as hypothyroidism and hyperthyroidism, and rheumatoid arthritis are significant contributors.

• Fluid retention: hormonal changes, pregnancy, and kidney or heart conditions can all increase fluid levels, adding pressure to the tunnel.

It is important to look beyond the wrist. Lifestyle factors such as diet and activity levels influence your systemic health. This can directly impact nerve resilience and inflammation levels in the body.

How is carpal tunnel syndrome detected?

Diagnosis typically involves a combination of physical examination, imaging, and blood tests to both confirm the compression and identify contributing systemic causes.

Physical examination: Clinicians use tests such as Tinel's sign and Phalen's manoeuvre to assess median nerve compression. Nerve conduction studies can confirm the diagnosis and gauge severity.

MRI: MRI can visualise the carpal tunnel directly, showing nerve swelling, flattening, or structural causes of compression such as cysts or thickened tendons. Elfcare offers targeted wrist MRI as a dedicated scan for this purpose. Our full body MRI also covers the cervical spine, which helps rule out cervical radiculopathy, a neck condition that can cause hand and finger symptoms nearly identical to CTS and requires a very different treatment approach.

Blood tests Blood tests do not diagnose CTS directly, but they can identify systemic conditions that that increase susceptibility. Relevant markers in Elfcare's panel include:

• HbA1c and glucose: blood sugar control; elevated levels are linked to peripheral nerve damage.

• TSH, Free T3, Free T4: thyroid function; hypothyroidism causes fluid retention that pressures the tunnel.

• CRP and Rheumatoid factor (RF): inflammation and inflammatory joint disease, both known contributors

Why early detection matters

Nerve health is key to independence and quality of life. Recognizing early signs of carpal tunnel syndrome, or the metabolic risks behind it, gives you an advantage, allowing simple proactive steps like improving your workspace, diet, or thyroid management.

Health changes often develop gradually, and by the time constant numbness appears, nerve pressure may have existed for a while. Without treatment, carpal tunnel can worsen, potentially causing permanent nerve damage and hand muscle loss.

Identifying an underlying cause such as undiagnosed hypothyroidism or poorly controlled diabetes opens the door to treatment that benefits far more than just your wrists.

How Elfcare can help

Elfcare assesses Carpal Tunnel Syndrome (CTS) through three integrated approaches:

• Targeted wrist MRI: provides high-resolution visualization of the median nerve to identify compression or structural causes without radiation.

• Full body MRI (cervical spine): evaluates the neck to rule out nerve root compression, which often mimics or coexists with CTS.

• Blood panel: screens for systemic factors, including HbA1c, thyroid function, and inflammatory markers, that can trigger or worsen nerve symptoms.

If your MRI reveals nerve compression or your blood work indicates an underlying metabolic cause, your Elfcare doctor will review these findings during your follow-up. We manage all further diagnostics and provide direct referrals to the appropriate specialist for treatment.