Pressure on the median nerve, one of the major nerves of the hand, causes carpal tunnel syndrome, a condition that leads to pain, numbness, tingling, and reduced function. People who regularly carry out repetitive hand movements often experience this disorder, such as those who work on computers, hair stylists, and massage therapists. Pregnant women are also highly susceptible. Wrist splints and exercises can ease symptoms of minor carpal tunnel, though advances cases may require surgery.
The tingling sensation known as pins and needles often develops when an extremity is kept in an awkward position for an extended time, such as when blood flow is interrupted or a nerve is compressed. People with carpal tunnel syndrome often experience a more intense and unpleasant version of this sensation. Usually, it only affects the thumb and fingers, but it can also spread to other areas of the arm.
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