A lump you can feel under the skin. A patch of numbness that keeps returning. A sharp, electric pain that tracks down an arm or leg when you stand, drive, or try to sleep. When symptoms seem “nerve-related” but don’t fit a clear injury, it’s reasonable to ask whether something is irritating or compressing the nerve itself. One possible cause is a schwannoma, a usually benign tumor that grows from the cells that support nerves. If you are looking for the best minimally invasive spine surgeon in Los Angeles because your symptoms aren’t improving or your imaging raised questions, the information below can help you understand what schwannomas are, what they can feel like, and how they’re typically evaluated.
What Is a Schwannoma?
A schwannoma is a tumor that develops from Schwann cells, which form the insulating covering around many nerves (often described as a protective “sheath”). Most schwannomas are benign (noncancerous) and slow-growing.
Even when benign, a schwannoma can still cause symptoms because nerves run through tight spaces. As a tumor gradually enlarges, it may press on the nerve it comes from, nearby nerves, or nearby structures such as the spinal cord (in certain spinal locations). That pressure can change sensation, trigger pain, or weaken the muscles that nerve controls.
Schwannomas can occur along peripheral nerves in the arms or legs, along spinal nerve roots, or on certain cranial nerves (nerves that connect directly to the brain). The specific symptoms depend far more on where the tumor is than on what the tumor is called.
What Schwannoma Symptoms Can Feel Like
Many people have no symptoms early on. When symptoms do show up, they usually build gradually. A common theme is persistence: symptoms that keep coming back, slowly worsen, or don’t match typical muscle strain.
Common symptoms can include:
- A noticeable lump along the path of a nerve, sometimes tender, sometimes painless
- Localized pain in one area or pain that radiates along a nerve pathway
- Tingling or numbness in the arm, hand, leg, or foot
- Weakness in a specific muscle group (for example, grip weakness or difficulty lifting the front of the foot
- Increased sensitivity or an “electric” sensation when the area is touched or bumped
These symptoms can overlap with more common problems like disc-related irritation or nerve compression from arthritis. That is why diagnosis relies on a clinician’s exam and imaging, not symptoms alone. If you are dealing with classic radiating arm or leg symptoms, it may help to review options for pinched nerve treatment while you pursue a definitive diagnosis.
Symptoms by Location: Spinal, Peripheral Nerve, and Cranial Nerve Schwannomas
Spinal Nerve Root Schwannoma Symptoms
When a schwannoma involves a spinal nerve root, symptoms can closely mimic a “pinched nerve.” Depending on whether the tumor is in the neck or low back, this may look like:
- Neck or low back pain with pain traveling into an arm or leg
- Numbness or tingling in a pattern that matches a specific nerve distribution
- Weakness in muscles controlled by that nerve (for example, trouble lifting the arm, straightening the wrist, or lifting the foot)
If there is significant compression in certain spinal locations, some patients may also develop balance changes or clumsiness. Those symptoms are not specific to schwannoma, but they are worth evaluating promptly.
Peripheral Nerve Schwannoma Symptoms (Arms and Legs)
Schwannomas can form along peripheral nerves outside the spine. A person may notice a slowly enlarging lump, discomfort when the area is pressed, or symptoms that “shoot” or travel with certain movements. Sometimes the main complaint is sensory (tingling, burning, numbness); other times it is motor (weakness or reduced coordination in a hand or foot).
Because these tumors arise from nerve tissue, diagnosis and treatment planning often benefits from experience in peripheral nerve surgery, especially when symptoms are interfering with daily function.
Vestibular (Acoustic) Schwannoma Symptoms
A vestibular schwannoma (often called an acoustic neuroma) affects the nerve involved in hearing and balance. Symptoms may include:
- Hearing changes, often gradual and commonly affecting one side
- Ringing in one ear (tinnitus)
- Dizziness or a sense of spinning
- Unsteadiness or balance problems
These symptoms have multiple possible causes. Still, persistent one-sided hearing changes or progressive balance issues are good reasons to ask your doctor whether imaging and specialty evaluation are appropriate.
Facial and Other Cranial Nerve Schwannoma Symptoms
Schwannomas can also develop on cranial nerves that influence facial sensation and movement. Depending on the nerve involved, possible symptoms include:
- Facial weakness or asymmetry
- Facial pain or altered sensation
- Trouble swallowing
- Changes in taste
- Eye movement problems or double vision (in select situations)
Because facial weakness and swallowing difficulty can also be associated with other urgent neurologic problems, prompt medical evaluation is recommended if these symptoms are new or worsening.
What Causes Schwannomas, and Who Gets Them?
Many schwannomas occur without an identifiable trigger. They can be found in adults across a range of ages, and they may occur in different locations throughout the body. Some schwannomas are associated with genetic conditions, but many patients diagnosed with a schwannoma have no known hereditary syndrome.
In practice, clinicians focus less on finding a single “cause” and more on confirming what the mass is, where it sits relative to the nerve, and whether it is affecting nerve function.
How Schwannomas Are Diagnosed
Evaluation typically starts with a detailed history and a focused neurologic exam. Your clinician may check strength, sensation, reflexes, coordination, gait, and whether symptoms follow a specific nerve distribution. If a schwannoma is suspected, imaging and nerve testing help clarify the diagnosis and rule out other problems.
Tests that may be used include:
- MRI, often the most informative test for characterizing soft tissue tumors and their relationship to nearby nerves
- CT scan, sometimes used for additional detail in specific situations or when MRI is not an option
- Electromyogram (EMG), which evaluates how well a nerve is functioning by measuring electrical activity in muscles
- Biopsy, in select cases when tissue diagnosis is needed to guide treatment
Depending on your symptoms and imaging, the differential diagnosis may include other spine conditions (when symptoms appear to originate in the neck or low back) or other brain conditions (when symptoms point to cranial nerve or intracranial involvement).
Treatment Options for Schwannoma
Treatment depends on the tumor’s location, size, growth behavior on imaging, and the type and severity of symptoms. In some situations, careful monitoring with periodic imaging may be appropriate, particularly when symptoms are minimal and the tumor appears stable.
When a schwannoma is causing progressive symptoms, affecting function, or compressing nearby structures, intervention may be recommended. If surgery is considered, planning is especially thoughtful because the tumor arises from nerve tissue and the goal is typically to relieve pressure while preserving neurologic function as much as possible.
When symptoms are driven by a spinal location, the discussion may involve options within spine surgery, including approaches designed to minimize tissue disruption when appropriate. For schwannomas affecting peripheral nerves, a peripheral nerve-focused surgical plan may be considered based on the nerve involved and the patient’s goals.
When to Seek Evaluation (and When to Seek Urgent Care)
Consider scheduling a medical evaluation if you notice:
- A new lump or a lump that seems to be enlarging
- Numbness, tingling, burning, or radiating pain that lasts weeks or keeps returning
- Weakness in an arm, hand, leg, or foot
- Persistent one-sided hearing changes, tinnitus, dizziness, or worsening balance
- New facial weakness, swallowing difficulty, or other cranial nerve-type symptoms
Seek urgent evaluation for rapidly worsening weakness, repeated falls or severe balance changes, or new bowel or bladder control problems. These can reflect significant nerve or spinal cord involvement from a range of conditions and should be assessed right away.
Schwannoma Evaluation with a Los Angeles Brain and Spine Specialist
Schwannoma symptoms can overlap with common diagnoses like disc problems or routine nerve irritation. The goal is not to self-diagnose—it is to get a clear explanation for symptoms that persist, progress, or don’t fit the usual pattern. At Yashar Neurosurgery, Parham Yashar, MD evaluates brain, spine, and peripheral nerve concerns with an emphasis on careful diagnosis, clear communication, and individualized treatment planning, including minimally invasive spine surgery when appropriate.
If you’re looking for the best minimally invasive spine surgeon in Los Angeles to evaluate unexplained nerve pain, numbness, weakness, or a concerning lump, contact Yashar Neurosurgery at (424) 209-2669 to request a consultation and review your symptoms and imaging.
