Welcome to NeuroTalk:
This is a huge question. There are over 100 causes of PN.
Please visit our forum, and make an introductory post, with some of your details, medical history, drug use, vaccines, diet, activities.
http://neurotalk.psychcentral.com/forum20.html
There is a subforum at that link and many many posts from people over the past 6 years, and also informational posts from me to help people deal with the various PNs. There is no way around doing some homework.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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These forums are for mutual support and information sharing only. The forums are not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider. Always consult your doctor before trying anything you read here.