Carpal tunnel syndrome: hand numbness, tingling and wrist care review

Carpal tunnel syndrome is a cause of hand numbness and tingling. This article explains what it is, what causes it and how it is managed, using information from the NHS, MedlinePlus and the US Centers for Disease Control and Prevention (CDC).

1. Introduction

Carpal tunnel syndrome is caused by pressure on a nerve in the wrist, which leads to tingling, numbness and pain in the hand and fingers ^[1]. The carpal tunnel is a narrow passage in the wrist. MedlinePlus explains that the median nerve, which gives feeling to the thumb and the first three fingers, passes through it, and that swollen or irritated tendons in the tunnel can press on the nerve ^[2].

The NHS says many people can manage the condition at home, but recovery can take months ^[1].

2. Causes and risk factors

Often no single cause is found. MedlinePlus says it usually results from a combination of factors ^[2]. The sources name these risk factors ^{[1, 2, 3]}:

• Repeated or forceful hand movements. Examples are bending the wrist often, gripping hard, assembly-line work and using vibrating tools. The CDC lists vibration, repetitive motion and awkward postures as causes of work-related muscle, nerve and joint problems ^[3].
• Pregnancy and menopause, and being overweight ^{[1, 2]}.
• Health conditions, such as diabetes, arthritis and thyroid problems ^{[1, 2]}.
• A previous wrist injury, such as a sprain or fracture ^{[1, 2]}.
• Family history. A close relative with the condition raises the risk ^{[1, 2]}.
• Sex. MedlinePlus says women are about three times as likely as men to be affected, and it mostly affects adults ^[2].

MedlinePlus notes that researchers have not shown whether long-term typing or computer use causes the condition ^[2].

3. Signs and symptoms

The NHS describes ^[1]:

• An ache or pain in the fingers, hand or arm.
• Numbness in the hand.
• Tingling or pins and needles.
• A weak thumb or difficulty gripping.

Symptoms often come on gradually, come and go and tend to be worse at night ^[1]. MedlinePlus says they mainly affect the thumb, index and middle fingers and may begin in the dominant hand. Later signs include pain or weakness when driving or holding a phone, trouble gripping small objects and a feeling of swollen fingers ^[2]. Without treatment, feeling in the fingers can be lost and thumb weakness can become permanent ^[2].

4. Diagnosis and tests

A health professional can usually diagnose the condition by discussing your symptoms and examining your hand ^[1]. If the diagnosis is unclear, you may be referred for a nerve conduction test, which measures how well electrical signals travel along the nerve, or for an ultrasound or MRI scan ^{[1, 2]}. MedlinePlus adds that blood tests may be used to look for conditions that can damage nerves, and X-rays can check for fractures or arthritis ^[2].

5. Treatment and management

MedlinePlus recommends starting treatment as early as possible, because early care is easier. Your doctor decides what is right for you, and any health condition behind the problem is treated first ^[2]. The sources describe these options ^{[1, 2]}:

Wrist splint

Wearing a splint at night keeps the wrist straight and eases pressure on the nerve. The NHS says it can take up to six weeks to feel better ^[1].

Changing activities

Cut back on tasks that involve frequent wrist bending or hard gripping, and rest the wrist ^{[1, 2]}.

Pain relief and hand exercises

A pharmacist or doctor can advise on pain relief, which may ease pain for a short time but does not treat the underlying cause ^[1]. The NHS says evidence for hand exercises is limited, but they may help symptoms. MedlinePlus says research suggests yoga may help pain and weakness, and that acupuncture and chiropractic care have not been shown to help. Check with your doctor before trying any of them ^{[1, 2]}.

Injections and surgery

If a splint does not help, a doctor may offer a steroid injection into the wrist to reduce swelling around the nerve, but symptoms can return after a few months ^[1]. Surgery to widen the tunnel is considered for severe symptoms, or when other treatments have not worked. The NHS says it is usually done under local anaesthetic without an overnight stay, and full return to normal activities can take about a month ^[1]. MedlinePlus says recovery can take months, and the condition rarely returns, although mild symptoms may remain ^[2].

6. Prevention and self-care

MedlinePlus suggests these steps ^[2]:

• Keep your wrists in a neutral, straight position when working.
• Take regular breaks and vary tasks.
• Stretch and exercise the hands and wrists.
• Keep your hands warm. Fingerless gloves may help.
• Set up your workspace and tools to reduce strain ^[2]. The CDC describes ergonomics as designing work tasks and job demands to fit the abilities of workers, with the goal of preventing work-related muscle, nerve and joint problems ^[3].

7. Special groups

Pregnancy. The NHS notes that carpal tunnel syndrome sometimes settles by itself within a few months, particularly when it is linked to pregnancy ^[1]. Workers using vibrating tools or doing repeated tasks. The CDC says employers and workers can work together on programmes to identify and reduce these risks ^[3]. People with diabetes, arthritis or thyroid problems need any underlying condition treated as part of their care ^[2]. Adults. The condition usually affects adults only ^[2].

8. When to see a doctor

See a doctor if your symptoms are getting worse or not going away, or if home treatment is not working ^[1]. Do not wait if you notice lasting numbness, loss of feeling in the fingers or a weak thumb, because untreated nerve pressure can cause lasting weakness ^[2]. In many areas you can refer yourself to NHS community musculoskeletal (bone, joint and muscle) services for physiotherapy without seeing a GP first ^[1]. Tell your doctor about every medicine, supplement and treatment you use.

In an emergency, call your local emergency number (112 in India, 911 in the United States).

9. Conclusion

Carpal tunnel syndrome is pressure on the median nerve in the wrist that causes tingling, numbness, weakness and pain in the hand, often worse at night. Repeated hand tasks, vibration, pregnancy, some health conditions and past injury raise the risk. Early treatment with splints, activity changes and, if needed, injections or surgery can help prevent lasting damage, and healthy wrist habits at work reduce strain. Your doctor decides the treatment that is right for you.