Which of the following tasks often causes carpal tunnel syndrome?

Carpal tunnel syndrome primarily arises from repetitive motions and sustained pressure on the median nerve that runs through the wrist. Among the options provided, using a computer keyboard involves continuous, repetitive movements of the fingers and wrists, often in awkward positions that can lead to strain. This sustained activity can irritate the median nerve, resulting in the symptoms characteristic of carpal tunnel syndrome, such as pain, numbness, and weakness in the hand.

While heavy lifting, operating a forklift, and driving a truck can contribute to other forms of strain and injuries, they are less directly associated with the repetitive wrist and finger movements that are most closely linked to the development of carpal tunnel syndrome. Heavy lifting may instead result in issues such as lower back pain or ergonomic-related injuries. In contrast, operating machinery or driving involves different types of physical demands that are less focused on repetitive wrist motion. Therefore, working extensively on a computer keyboard is the task most commonly related to the onset of carpal tunnel syndrome.