Paraneoplastic neuropathy (PNS) is a neuromuscular disorder caused by the remote effects of tumors and is presumed to be primarily caused by an immune-mediated mechanism due to the appearance of anti-neuronal antibodies. In addition to the classical PNS syndromes already established as syndromes, there are an increasing number of reports of PNS that target membrane proteins on the cell surface such as channels. Diagnosing PNS, which often precedes associated tumors, is clinically important because it allows for early detection of tumors and early intervention.