Very few people that have neuropathy, from any cause, have truly symmetric neuropathy at all times. Even people who have toxic neuropathy, such as from chemotherapy, may have one part of the body affected more than others--and that part may switch over time, and go back and forth.

Symmetric in the end just means both sides of the body midline have expereinced some effects. Symptoms in just one part of the body consistently imply a mononeuropathy, often becasue some nerve area is particularly vulnerable to compressive effects. Often, what seems to start our asymmetric can affect both sides of the body midline over time, though in different places.