The carpal tunnel syndrome (or carpal tunnel) is a compression of the median nerve under the palmar annular ligament of the carpus.
The carpal tunnel syndrome is characterised by tingling or morning numbness in the three first fingers (thumb, index and middle fingers). If the phenomenon is accentuated, it can wake the patient up at night, but disappear during the day.
In the more advanced cases, there is a decline and even a disappearance of sensitivity, accompanied by clumsiness. In addition, some of the muscles of the thumb atrophy, resulting in a weak hand.
The diagnosis can be confirmed by an additional examination (electromyography) to specify the level of amount of compression.
For more information and medical references: