BACKGROUND: The phenotype of large diameter sensory afferent neurons changes in several models of neuropathic pain. We asked if similar changes also occur in "functional" pain syndromes. METHODOLOGY/PRINCIPAL FINDINGS: Acidic saline (AS. pH 4. https://www.bekindtopets.com/hot-super-2024-Strafe-Hayden-Men-s-Jacket-great-choice/