I will have to repeat what I do for all new members here.

Don't accept "normal" from your doctor for B12 tests. The lab ranges in the US still go down to 200, or 180 and that is now (for the last DECADE) considered LOW. The new lowest normal is 400pg/ml.
One needs to stop all vitamins for about a week before any testing,
to get an accurate picture of levels.

Here is a medical website explaining:
http://www.aafp.org/afp/2003/0301/p979.html

So patients having testing should ask for their numerical results, and compare with the new medical protocols. Otherwise neurological symptoms may continue.

Rheumatoid arthritis is inheritable, so family members should get tested to see if they have elevated rH factor.
People may have positive results on this test and be symptom free until the unknown trigger comes along and triggers it.
This is thought be be infectious and perhaps viral or other organism at this time. This test also has a high false negative
factor so it is not a supremely accurate test.

Other possibilities for young people with early onset PN are hereditary Charcot Marie Tooth, or some toxic exposure from drugs, solvents, etc. Gluten intolerance can also appear in young age groups, so going gluten free (no wheat, barley, rye) may help. This dietary factor is becoming identified more often today than in the past, and some doctors are still unaware of the new research.

This link is very complete and has a neuropathy section:
https://sites.google.com/site/jccglu...eralneuropathy