Numbness in both hands when the head is bowed, this situation is caused by cervical disc herniation, because when the head is bowed, the pressure between the vertebrae increases, which will lead to the disc being squeezed by a greater force, and in the process of cervical spine forward flexion will lead to the disc protruding backward, which is easy to stimulate the nerve roots bilaterally, and the nerve roots are stimulated, which leads to the emergence of the nerve distribution in the upper limb position easily after ischemia. Numbness. After this situation, you need to go to the hospital for cervical spine CT and magnetic resonance examination, to see the specific situation of herniation, to see whether there are other abnormal foci, the nerve tissue structure of the stimulation of extrusion, in order to be able to carry out targeted treatment. Be sure to minimize the time of low head to reduce the ischemia caused by nerve compression, or cause irreversible damage to the nerve, which will affect the therapeutic effect.