More than 20 million people in the U.S. suffer neuropathic pain. At least 25% of those cases are classified as unexplained and considered cryptogenic sensory polyneuropathy (CSPN). There is no information...

There are three main types of pain: nociceptive pain, the type we’re most familiar with, from bee stings and ankle strains to inflammatory arthritis. There’s neuropathic pain, arising from...