A patient-friendly guide to what the peripheral nervous system does, what symptoms may signal nerve irritation or injury, how doctors pinpoint the source, and when peripheral nerve surgery may be considered.
Maybe it starts with your hand falling asleep when you drive. Or a burning, electric sensation in your forearm that shows up after typing. Or a foot that feels numb on the bottom, making you second-guess your balance on stairs. When these symptoms linger, it is natural to worry about a nerve problem—and to search for a specialist, including the best carpal tunnel release surgeon in Los Angeles, if the symptoms point to the wrist.
The challenge is that “nerve pain” is not one diagnosis. Symptoms in the hand or foot can come from a peripheral nerve (outside the brain and spinal cord) or from a pinched nerve in the neck or low back. This guide explains the peripheral nervous system in plain language, common patterns of nerve irritation and injury, and the practical next steps for evaluation and treatment.
Your nervous system has two main parts. The central nervous system is your brain and spinal cord. The peripheral nervous system is everything else: the nerves that branch out from the spinal cord and travel into your shoulders, arms, hands, pelvis, legs, and feet.
Peripheral nerves act like two-way cables. They carry signals that:
Because peripheral nerves pass through tight anatomical “tunnels” (like the wrist and elbow) and across joints that bend and rotate, they can be irritated by swelling, repetitive motion, scar tissue, or trauma.
There are many peripheral nerves in the body. A few that commonly cause symptoms in daily life include the following.
The brachial plexus is a network of nerves that begins in the lower neck and travels through the shoulder region into the arm. Because it is a “nerve hub,” problems here can affect broad areas of arm sensation and strength. Brachial plexus injuries may occur after significant traction or impact (for example, certain sports injuries or accidents) and can cause weakness, numbness, or pain across the shoulder, arm, or hand.
The radial nerve runs along the back of the arm and forearm and helps control extension—straightening the elbow, wrist, and fingers. Irritation can lead to numbness on parts of the back of the hand and difficulty extending the wrist or fingers, depending on where the nerve is affected.
The spinal accessory nerve helps power key shoulder and neck movements, particularly the trapezius and sternocleidomastoid muscles. When it is injured (sometimes after surgery in the neck or certain traumas), people may notice shoulder droop, pain with overhead activity, or weakness when shrugging.
The tibial nerve is one of the major branches of the sciatic nerve and travels down the back of the leg into the foot. It contributes to sensation on the bottom of the foot and helps control muscles that point the toes and support the arch. Symptoms can include numbness or burning on the sole, cramping, or weakness with push-off when walking, depending on the level of irritation.
The ulnar nerve passes behind the inner elbow (the “funny bone”) and continues into the hand. It supplies sensation to the pinky and part of the ring finger and powers many small hand muscles used for fine motor control. Ulnar nerve irritation may cause numbness in the ring and pinky fingers, hand weakness, or clumsiness with gripping and finger coordination.
Symptoms do not always follow a perfect diagram. That is why the combination of your symptom pattern, a careful exam, and the right testing matters more than trying to self-diagnose based on one sensation.
Peripheral nerve symptoms often feel different than muscle strain or joint pain. Many people describe them as “electric,” “burning,” or “pins and needles.” Common signs include:
It is also common for nerve symptoms to fluctuate—better in the morning, worse after repetitive activity, or worse in certain sleeping positions.
One of the most important questions in nerve care is where the nerve is being irritated. Numbness in the hand might come from nerve compression at the wrist or elbow, but it can also come from a nerve root in the neck. Similarly, symptoms in the foot may come from the ankle region, the knee, or the low back.
If your symptoms start in the neck or back and then travel into an arm or leg, you may be dealing with a spinal source. Our page on pinched nerve treatment explains how spine-related nerve compression can create symptoms far from the spine itself.
When patients are told “it’s carpal tunnel” or “it’s coming from your neck” without a thorough workup, it can delay the right treatment. A focused evaluation is designed to localize the problem rather than guess.
Peripheral nerve problems usually fall into a few categories:
Entrapment occurs when a nerve is repeatedly compressed as it passes through a tight space—such as the wrist, elbow, or ankle. Swelling, repetitive motion, anatomical crowding, and scar tissue can all contribute. Symptoms often worsen with specific activities or positions and can become more constant over time.
In a fall, collision, or high-impact sports injury, a nerve can be stretched. The brachial plexus is a common site for traction-type injuries around the shoulder and neck.
Fractures, dislocations, deep cuts, or crush injuries can bruise or damage a nerve directly. The severity can range from temporary irritation to partial injury to complete disruption, and early evaluation can influence the options available.
Sometimes the nerve itself is intact, but it becomes tethered or irritated by scar tissue, which can cause persistent pain, numbness, or dysfunction—especially with motion.
If you are trying to make sense of multiple symptoms across the body—neck pain plus hand numbness, or back pain plus leg tingling—our spine conditions hub can help you understand common spine-related causes that overlap with peripheral nerve symptoms.
Because different nerve problems can feel similar early on, diagnosis is less about one test and more about putting the pieces together. A typical workup may include:
If you have rapidly worsening weakness, a new foot drop, significant hand weakness, or symptoms after a major injury, it is reasonable to seek evaluation promptly rather than waiting to see if it fades.
Treatment depends on the nerve involved, how long symptoms have been present, and whether the nerve is irritated versus significantly compressed or injured.
Many people improve without surgery, especially when symptoms are caught early. Depending on the diagnosis, non-surgical care may include activity modification, bracing or splinting for certain entrapments, targeted physical or occupational therapy, and medications to address inflammation or nerve pain.
If symptoms are ultimately traced back to the neck or low back, treatment may overlap with broader spine care. You can learn more about surgical and non-surgical options through our spine surgery overview, which includes minimally invasive approaches when appropriate.
Surgery is not automatically the next step for nerve symptoms. It may be considered when there is clear evidence of a surgically treatable compression, persistent symptoms despite appropriate conservative treatment, or progressive weakness or functional loss. Depending on the problem, surgery may focus on:
More detail about procedures and goals of care is available on our peripheral nerve surgery page.
Nerve symptoms can be disruptive in very practical ways—sleeping through the night, feeling safe behind the wheel, keeping up at work, or simply holding a coffee cup without pain. The right plan starts with an accurate diagnosis: identifying whether the problem is a peripheral nerve entrapment (such as in the wrist or elbow), a nerve injury after trauma, or a spinal source referring symptoms into the arm or leg.
At Yashar Neurosurgery, Parham Yashar, MD, evaluates peripheral nerve and spine-related nerve conditions with a careful exam, thoughtful testing when indicated, and a clear discussion of both non-surgical options and surgical solutions when they make sense. If you are looking for the best carpal tunnel release surgeon in Los Angeles or need a second look at persistent numbness, tingling, or weakness, call (424) 209-2669 or request a consultation at our office at 8436 W. 3rd Street, Suite 800, Los Angeles, CA 90048.
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