carpal tunnel syndrome

What Is It?
Carpal tunnel syndrome (CTS) is a condition that occurs when the median nerve, which runs through a narrow passage in the wrist called the carpal tunnel, becomes compressed or pinched. This nerve controls sensation and movement in parts of the hand, particularly the thumb, index, middle, and part of the ring fingers. When compressed, it leads to pain, numbness, tingling, and weakness in the hand and arm.

Why It Matters
CTS is one of the most common nerve compression disorders, especially in people who perform repetitive hand motions or use vibrating tools. It can affect work productivity, especially for those who use their hands frequently (e.g., typists, assembly line workers, mechanics). If left untreated, CTS can cause permanent nerve damage and loss of hand function.

Key Facts (At a Glance)

  • Affects 4–5% of adults in the U.S.

  • More common in women than men

  • Frequently seen in people aged 40–60

  • Often work-related, especially involving repetitive hand use

  • Associated with conditions like diabetes, obesity, pregnancy, hypothyroidism, and arthritis

How It Affects the Body
The median nerve travels from the forearm into the hand through the carpal tunnel, a narrow passage made of bones and ligaments.
When the surrounding tissues (like tendons) become inflamed or swollen, they compress the nerve. This leads to:

  • Reduced blood flow and nerve function

  • Impaired hand sensation and muscle control

  • Potential muscle atrophy in the base of the thumb (thenar muscles) if severe or chronic

Common Symptoms

  • Tingling or numbness in the thumb, index, middle, and ring fingers

  • Pain or burning sensation in the hand or wrist, sometimes extending up the arm

  • Weak grip strength

  • Dropping objects due to decreased hand control

  • Symptoms often worse at night or after repetitive use

Risks & Side Effects
If untreated, CTS can lead to:

  • Chronic pain

  • Permanent nerve damage

  • Weakness or muscle wasting in the thumb area

  • Reduced hand function impacting daily activities
    Treatments such as surgery or steroid injections carry typical risks like infection or bleeding but are generally effective.

Who Should Be Cautious

  • Individuals with jobs involving repetitive hand use (e.g., data entry, sewing, assembly line work)

  • Pregnant women (due to fluid retention)

  • People with diabetes, thyroid disorders, or rheumatoid arthritis

  • Those using vibrating hand tools

  • People with a family history of CTS

When to See a Doctor
Consult a provider if you:

  • Have persistent numbness, tingling, or pain in your fingers or hand

  • Notice symptoms that interfere with daily tasks

  • Wake up at night with hand discomfort

  • Experience worsening grip strength or muscle weakness
    Early diagnosis can prevent permanent nerve damage. Tests may include a physical exam, nerve conduction studies, or electromyography (EMG).

Related Conditions / Interactions

  • Trigger finger, De Quervain’s tenosynovitis, and arthritis may coexist with CTS

  • Diabetes and hypothyroidism increase risk

  • Can be mistaken for cervical radiculopathy or peripheral neuropathy

  • Pregnancy-related CTS often resolves postpartum

Last Updated: June 16, 2025