C8-t1 Nerve Damage Symptoms Jun 2026

Damage to the C8 and T1 nerve roots—the lower-most nerves of the cervical and upper thoracic spine—primarily affects the dexterity and strength of the hand and forearm. These nerves form the lower trunk of the brachial plexus, and their dysfunction can lead to a specific pattern of symptoms known as or a "claw hand" deformity.

The T1 nerve root carries sympathetic (autonomic) nerve fibers that innervate the head, neck, and upper eyelid. Isolated C8 damage does not cause autonomic issues, but combined C8-T1 injury, or isolated T1 injury, will produce . This triad includes: c8-t1 nerve damage symptoms

Nerve damage often causes "pins and needles" (paresthesia) or numbness that follows a specific path known as a dermatome. C7-T1 Bulging Disc Symptoms: Neck Pain & Hand Weakness Damage to the C8 and T1 nerve roots—the

To understand the symptoms, one must first understand the anatomy. The spinal cord is encased within the vertebral column. Nerves exit the spinal cord through small openings called foramina. Isolated C8 damage does not cause autonomic issues,

Note: Horner’s syndrome is a critical red flag. Its presence suggests a proximal lesion affecting the T1 root or lower trunk, often due to an apical lung tumor (Pancoast tumor), a cervical rib, or a traumatic avulsion.