Numbness in the shoulder and neck area is due to the stimulation and compression of the dermal nerves or nerves passing through the muscular space in the shoulder and neck area. The pressure inside the local soft tissues may increase, which may cause compression and irritation to the surrounding nerves. In the second case, the skin and flesh become fatigued and tense because the shoulder and neck are in a continuous posture. In addition, the accumulation of local inflammatory metabolic products due to frequent exposure to cold may also form inflammatory edema, which may stimulate the nerves in the shoulder and neck area and cause numbness. In the third case, numbness may occur due to nerve entrapment, such as adhesions, hyperplasia, and local scar formation at the location of local nerve penetration, which may lead to narrowing of the gap, resulting in numbness due to nerve stimulation.