There are three main causes of pain in the left wrist: First, the wrist suffers a huge trauma, such as a violent impact or strain caused by lifting or carrying heavy objects, which can lead to local damage to the small nerves, resulting in local inflammatory edema, stimulating the peripheral nerves will appear obvious pain, and when moving the joint, the pain symptoms are further aggravated. Second, due to frequent wrist flexion and extension movements, resulting in muscle, ligament or tendon strain, often in the cold will further aggravate the pain symptoms. After warm water bags and appropriate activities, the symptoms can be improved. Third, due to frequent activities such as construction sites, the root of the palm will be stimulated when holding a drill, which can easily form lunar osteonecrosis. The lunar bone is a bone in the wrist, due to frequent vibration, resulting in a decline in blood circulation, the possibility of lunar necrosis, will also cause pain in the wrist.