Numbness in both arms may be related to the following etiologies: 1. There may be a case of thoracic outlet syndrome. This type of disease is mainly due to the location of the thoracic outlet, there are some compressive factors, such as severe osteophytes, muscle spasms and congenital malformations, resulting in the nerves and blood vessels leading to the bilateral upper limbs are compressed, may cause bilateral upper limbs numbness. 2, may exist in the spine related occupational diseases. If there is a serious medullary cervical spondylosis, it may also cause bilateral upper limb numbness. 3, there may be brain-related lesions, such as cerebral infarction, cerebral hemorrhage, may involve the bilateral upper limbs to cause numbness. 4, there may be complications of diabetes, such as long-term hyperglycemia, may cause damage to nerve endings, and then cause bilateral upper limb numbness.