Systemic inflammatory disease associated with an acquired peripheral neuropathy

Systemic inflammatory disease associated with an acquired peripheral neuropathy (Orphanet code 209007) is a clinical grouping rather than a single discrete disease entity. It encompasses conditions in which a systemic inflammatory or autoimmune process leads to damage of the peripheral nerves as a secondary manifestation. Examples of underlying systemic inflammatory diseases that can cause acquired peripheral neuropathy include systemic lupus erythematosus, rheumatoid arthritis, sarcoidosis, Sjögren syndrome, and various forms of systemic vasculitis. The peripheral neuropathy in these conditions arises because the inflammatory process damages the vasa nervorum (small blood vessels supplying the nerves) or directly infiltrates nerve tissue, leading to axonal degeneration or demyelination. Patients typically present with symptoms of the underlying systemic inflammatory condition — such as joint pain, skin rashes, fatigue, fever, or organ-specific involvement — alongside neurological symptoms including numbness, tingling, burning pain, weakness, and loss of reflexes in the extremities. The neuropathy may be symmetric or asymmetric (mononeuritis multiplex), and can affect sensory, motor, or autonomic nerve fibers depending on the underlying disease and mechanism of nerve injury. Electrodiagnostic studies (nerve conduction studies and electromyography) and nerve biopsy may be used to characterize the neuropathy. Treatment is directed at controlling the underlying systemic inflammatory disease, typically with immunosuppressive or immunomodulatory therapies such as corticosteroids, cyclophosphamide, azathioprine, mycophenolate mofetil, or biologic agents, depending on the specific diagnosis. Symptomatic management of neuropathic pain with medications such as gabapentin, pregabalin, or duloxetine may also be employed. Physical therapy and rehabilitation can help maintain function. Prognosis varies widely depending on the underlying condition, the severity and distribution of nerve involvement, and the response to immunosuppressive treatment.

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