The axillary nerve is a branch of the brachial plexus, a group of nerves that originate in the neck and run down the arm. It supplies the deltoid muscle and the skin over the shoulder. An injury to the axillary nerve can lead to weakness or paralysis of the deltoid muscle and loss of sensation over the shoulder.
The most common cause of axillary nerve injury is trauma, such as a fall or a direct blow to the shoulder. Other causes include shoulder dislocation or surgery in the shoulder region. Symptoms of axillary nerve injury include weakness or inability to lift the arm, numbness or tingling over the shoulder, and pain in the shoulder region.
If you suspect that you have an axillary nerve injury, it is important to seek medical attention. Your doctor will perform a physical exam and may order imaging tests such as an X-ray or MRI to confirm the diagnosis. Treatment for axillary nerve injury depends on the severity of the injury. Mild cases may resolve on their own with rest and physical therapy, while more severe cases may require surgery.
Overall, an injury to the axillary nerve can be painful and limit your ability to use your arm. Seeking medical attention and following your doctor's treatment plan can help you recover and regain full use of your shoulder and arm.