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1.

Small fiber neuropathy

Disorder of the peripheral nerves that primarily impair small nerve fibers. The affected small nerve fibers include myelinated A-delta fibers (see A FIBERS) and unmyelinated C FIBERS. Because these small fibers innervate skin and help control autonomic function, their neuropathy presents with neuropathic pain, reduced thermal and pain sensitivity, and autonomic dysfunction (e.g. abnormal sweating or facial flushing). Small fiber neuropathy can be idiopathic or associated with underlying diseases (e.g., AMYLOIDOSIS; DIABETES MELLITUS; SARCOIDOSIS; or VASCULITIS). [from MeSH]

MedGen UID:
478336
Concept ID:
C3276706
Disease or Syndrome
2.

Primary erythromelalgia

SCN9A-related inherited erythromelalgia (SCN9A-related IEM) is characterized by recurrent attacks of bilateral and symmetric intense pain, redness, warmth, and swelling involving the feet and, less frequently, the hands. SCN9A-related IEM is not associated with an organic disease. Manifestations may vary within a family. Onset is usually in childhood or adolescence but has been recognized in infants and adults. At onset, episodes are triggered by warmth; other precipitating factors include: exercise, tight shoes, wearing socks, alcohol, spicy foods, and other vasodilating agents. In advanced disease, symptoms may occur many times a day or become constant. Some individuals have allodynia (pain evoked by a normally innocuous stimulus) and hyperalgesia (increased sensitivity to a painful stimulus). Episodes may be disabling, interfere with sleep, and severely limit normal activities such as walking, participation in sports, wearing socks and shoes, and attending school or going to work. [from GeneReviews]

MedGen UID:
8688
Concept ID:
C0014805
Disease or Syndrome

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