Carpal Tunnel Syndrome

Overview

Carpal tunnel syndrome is caused by pressure on the median nerve. The carpal tunnel is a narrow passageway surrounded by bones and ligaments on the palm side of the hand. When the median nerve is compressed, symptoms can include numbness, tingling, and weakness in the hand and arm.

The anatomy of the wrist, health problems and possibly repetitive hand motions can contribute to carpal tunnel syndrome.

Proper treatment usually relieves the tingling and numbness and restores wrist and hand function.

Symptoms

Carpal tunnel syndrome symptoms usually start gradually and include:

1.Tingling or numbness. You may notice tingling and numbness in the fingers or hand. Usually the thumb and index, middle or ring fingers are affected, but not the little finger. You might feel a sensation like an electric shock in these fingers.

The sensation may travel from the wrist up the arm. These symptoms often occur while holding a steering wheel, phone or newspaper, or may wake you from sleep.

Many people "shake out" their hands to try to relieve their symptoms. The numb feeling may become constant over time.

2.Weakness. You may experience weakness in the hand and drop objects. This may be due to the numbness in the hand or weakness of the thumb's pinching muscles, which are also controlled by the median nerve.

Treatment

Although it is a gradual process, for most people carpal tunnel syndrome will worsen over time without some form of treatment. For this reason, it is important to be evaluated and diagnosed by your doctor early on. In the early stages, it may be possible to slow or stop the progression of the disease.

Causes

Carpal tunnel syndrome is caused by pressure on the median nerve.

The median nerve runs from the forearm through a passageway in the wrist (carpal tunnel) to the hand. It provides sensation to the palm side of the thumb and fingers, except the little finger. It also provides nerve signals to move the muscles around the base of the thumb (motor function).

Anything that squeezes or irritates the median nerve in the carpal tunnel space may lead to carpal tunnel syndrome. A wrist fracture can narrow the carpal tunnel and irritate the nerve, as can the swelling and inflammation caused by rheumatoid arthritis.

Many times, there is no single cause of carpal tunnel syndrome. It may be that a combination of risk factors contributes to the development of the condition.

Risk factors

A number of factors have been associated with carpal tunnel syndrome. Although they may not directly cause carpal tunnel syndrome, they may increase the risk of irritation or damage to the median nerve. These include:

1.Anatomic factors. A wrist fracture or dislocation, or arthritis that deforms the small bones in the wrist, can alter the space within the carpal tunnel and put pressure on the median nerve.People who have smaller carpal tunnels may be more likely to have carpal tunnel syndrome.

2.Sex. Carpal tunnel syndrome is generally more common in women. This may be because the carpal tunnel area is relatively smaller in women than in men.

Women who have carpal tunnel syndrome may also have smaller carpal tunnels than women who don't have the condition.

3.Nerve-damaging conditions. Some chronic illnesses, such as diabetes, increase the risk of nerve damage, including damage to the median nerve.

4.Inflammatory conditions. Rheumatoid arthritis and other conditions that have an inflammatory component can affect the lining around the tendons in the wrist and put pressure on the median nerve.

5.Medications. Some studies have shown a link between carpal tunnel syndrome and the use of anastrozole (Arimidex), a drug used to treat breast cancer.

6.Obesity. Being obese is a risk factor for carpal tunnel syndrome.

7.Body fluid changes. Fluid retention may increase the pressure within the carpal tunnel, irritating the median nerve. This is common during pregnancy and menopause. Carpal tunnel syndrome associated with pregnancy generally gets better on its own after pregnancy.

8.Other medical conditions. Certain conditions, such as menopause, thyroid disorders, kidney failure and lymphedema, may increase the chances of carpal tunnel syndrome.

9.Workplace factors. Working with vibrating tools or on an assembly line that requires prolonged or repetitive flexing of the wrist may create harmful pressure on the median nerve or worsen existing nerve damage, especially if the work is done in a cold environment.

However, the scientific evidence is conflicting and these factors haven't been established as direct causes of carpal tunnel syndrome.

Several studies have evaluated whether there is an association between computer use and carpal tunnel syndrome. Some evidence suggests that it is mouse use, and not the use of a keyboard, that may be the problem. However, there has not been enough quality and consistent evidence to support extensive computer use as a risk factor for carpal tunnel syndrome, although it may cause a different form of hand pain.

Prevention

There are no proven strategies to prevent carpal tunnel syndrome, but you can minimize stress on the hands and wrists with these methods:

1.Reduce your force and relax your grip. If your work involves a cash register or keyboard, for instance, hit the keys softly. For prolonged handwriting, use a big pen with an oversized, soft grip adapter and free-flowing ink.

2.Take short, frequent breaks. Gently stretch and bend hands and wrists periodically. Alternate tasks when possible. This is especially important if you use equipment that vibrates or that requires you to exert a great amount of force. Even a few minutes each hour can make a difference.

3.Watch your form. Avoid bending your wrist all the way up or down. A relaxed middle position is best. Keep your keyboard at elbow height or slightly lower.

4.Improve your posture. Incorrect posture rolls shoulders forward, shortening the neck and shoulder muscles and compressing nerves in the neck. This can affect the wrists, fingers and hands, and can cause neck pain.

5.Change your computer mouse. Make sure that your computer mouse is comfortable and doesn't strain your wrist.

6.Keep your hands warm. You're more likely to develop hand pain and stiffness if you work in a cold environment. If you can't control the temperature at work, put on fingerless gloves that keep the hands and wrists warm.

When to see a doctor

See your health care provider if you have signs and symptoms of carpal tunnel syndrome that interfere with your normal activities and sleep patterns. Permanent nerve and muscle damage can occur without treatment.

How do you fix carpal tunnel syndrome?

8 Ways to Get Carpel Tunnel Relief

1.Wear a splint. A splint can hold your wrist in a way that relieves pressure on the median nerve. ...

2.Add warmth. ...

3.Ice it. ...

4.Give your wrists a workout. ...

5.Raise the wrist. ...

6.Nonsteroidal anti-inflammatory drugs (NSAIDs), can provide short-term relief from CTS.

7.Steroid injections. ...

8.Consider surgery.

What foods should you avoid if you have carpal tunnel syndrome?

Avoid highly processed foods because they are often injected with modified proteins that increase inflammation, and thus your carpal tunnel pain symptoms worse. Other foods to avoid include carbs and fried foods. Salty foods and alcohol can have dehydrating effects, which can actually worsen swelling.

Is heat or ice better for carpal tunnel?

Most doctors agree that using heat is the better way to “treat” carpal tunnel syndrome. Unlike ice, heat promotes healing and restoration of damaged tissues. The healing process is what will ultimately make the inflammation disappear for good. Therefore, a hot towel or heating pad will do just fine.