A brachial plexus injury can disrupt feeling and strength in the shoulder, arm, and hand—here’s how to recognize symptoms, understand injury types, and know when a specialist evaluation may be time-sensitive.
After a car accident, sports collision, or a hard fall, it’s common to focus on the obvious injuries—bruises, shoulder pain, or a sore neck. But if you’re also dealing with electric or burning pain down the arm, new numbness in the hand, or weakness that makes it hard to lift, grip, or type, the problem may involve the brachial plexus. This nerve network is the “signal highway” between your neck and your upper limb, and when it’s stretched or torn, everyday tasks can suddenly feel out of reach.
This guide explains what a brachial plexus injury is, the symptoms that deserve attention, the main injury patterns doctors look for, and how treatment decisions are made—especially when timing can affect recovery.
The brachial plexus is a group of nerves that starts near the spinal cord in the neck and travels through the shoulder region into the arm. These nerves control sensation and movement in the shoulder, arm, wrist, and hand.
Because the brachial plexus sits in the transition zone between the neck and shoulder, it can be injured when the head and neck are forced away from the shoulder (stretching the nerves), when the shoulder is driven downward, or when there is direct trauma to the area. Many brachial plexus injuries occur alongside other injuries, including shoulder or collarbone trauma and, in some cases, cervical spine injuries—which is one reason a careful evaluation matters.
Brachial plexus injuries don’t always feel like a typical muscle or joint injury. Pain can be severe or surprisingly minimal. Weakness can show up immediately, or it can become noticeable over days as swelling and inflammation evolve.
Symptoms that may suggest a brachial plexus injury include:
If you were evaluated in the emergency department after major trauma, clinicians may monitor your neurologic status over time. If the initial injury didn’t seem severe and you weren’t seen right away, it’s still worth seeking care if these symptoms appear or persist—especially if weakness is getting worse.
Brachial plexus injuries can also occur during childbirth. Parents may notice that a baby isn’t moving one arm normally, keeps one arm in a different position, or seems to favor one side in the days after delivery.
Some newborn brachial plexus injuries improve with time and gentle therapy, while others require closer follow-up. The key is early recognition and appropriate monitoring so families understand what type of injury is suspected and what milestones to watch for.
Clinicians often describe brachial plexus injuries based on the severity and where the nerve is disrupted. These categories help guide next steps and set expectations.
Neuropraxia is generally the mildest category. The nerve has been stretched and temporarily “stunned,” but it is not torn. Many stretch injuries improve with time, and treatment often focuses on pain control and rehabilitation while the nerve recovers.
A rupture means the nerve is partially or fully torn somewhere along its path, but not at the point where it connects to the spinal cord. Depending on which nerves are involved and how much function is lost, surgery may be considered to help restore nerve input to key muscles, followed by structured rehabilitation.
Avulsion is among the most severe injury patterns. It occurs when the nerve root is torn away from its attachment at the spinal cord. These injuries are complex; treatment planning often involves discussing what function may be realistically regained and which surgical strategies may be appropriate in select cases.
Brachial plexus injuries are also commonly described by location (for example, upper trunk, lower trunk, or more extensive “pan-plexus” involvement). Location matters because it influences which movements are weak (shoulder elevation, elbow bending, wrist/hand function) and which areas feel numb.
Evaluation starts with a detailed history (what happened, how the arm felt immediately after, and what has changed since) and a focused neurologic exam. Your clinician will map strength, reflexes, and sensation to identify which nerves appear affected.
Testing often includes a combination of:
Because symptoms that travel into the arm can also come from the neck, clinicians may evaluate for cervical spine causes as well. Exploring related information on spine conditions can be helpful if your symptoms started with neck pain or radiate in a pattern that suggests nerve involvement from the cervical spine.
Treatment depends on the mechanism (stretch versus tear), how much strength and sensation are affected, and whether function is improving. Some injuries recover with time and therapy. Others may be time-sensitive because muscles that don’t receive nerve signals for an extended period can weaken and lose their ability to function normally even if the nerve later improves.
For injuries expected to recover, treatment often focuses on protecting range of motion and preventing stiffness while the nerve heals. Physical therapy can help maintain joint mobility, reduce compensatory strain, and support safe return to activity. Pain management may include anti-inflammatory medication, nerve-pain medications in select cases, or targeted strategies recommended by your physician.
If there is evidence of a more severe injury (such as rupture or avulsion) or if meaningful function is not returning, a specialist may discuss surgical options designed to restore nerve input to critical muscles. The exact approach varies by injury type and location, and rehabilitation remains an important part of recovery.
If you’ve been told to “wait and see,” but you have significant weakness, worsening symptoms, or little improvement over time, it’s reasonable to ask whether a specialist evaluation is appropriate sooner rather than later.
Seek emergency care if you experience sudden or severe arm weakness, a completely limp arm, symptoms after major trauma, or neurologic changes that could suggest a broader injury. Also seek urgent evaluation if numbness or weakness is rapidly progressing or if you have concerning symptoms beyond the arm (such as difficulty walking, new balance problems, or loss of bladder/bowel control), which may indicate a more serious neurologic issue.
Arm and hand function affects nearly everything: driving, working, cooking, exercising, and sleeping comfortably. The most helpful next step is getting a clear diagnosis—what nerve pattern is involved, how severe the injury appears, and whether you should be monitoring recovery, starting targeted therapy, or discussing time-sensitive treatment options.
At Yashar Neurosurgery, Dr. Parham Yashar evaluates complex neurologic problems, including conditions that involve nerve-related arm pain, numbness, and weakness. When appropriate, we also coordinate care across related areas of the nervous system, including brain conditions and spine surgery when symptoms or imaging suggest an overlapping cause.
If you’re looking for a Los Angeles neurosurgeon to evaluate persistent arm weakness, numbness, or shooting pain after trauma, you can contact Yashar Neurosurgery at (424) 209-2669 to schedule a consultation at 8436 W. 3rd Street, Suite 800, Los Angeles, CA 90048.
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