TetrodotoxinPainChronic PainPain ManagementPain ThresholdPain, PostoperativeLow Back PainBack PainPain MeasurementAbdominal PainNeck PainPain, IntractableSaxitoxinPelvic PainPain PerceptionSodium Channel BlockersFacial PainAcute PainPain, ReferredSodium ChannelsVeratridineShoulder PainAction PotentialsElectric StimulationSodiumMembrane PotentialsMusculoskeletal PainAtropineAnesthetics, LocalTetraodontiformesMuscle ContractionGuinea PigsMuscle, SmoothAnalgesicsFishes, PoisonousProtoveratrinesVeratrineLidocaineNociceptive PainNeuralgiaNeuronsElectrophysiologyPotassiumCalciumRats, Sprague-DawleyGuanethidineSynaptic TransmissionIon ChannelsTetraethylammonium CompoundsAnalgesics, OpioidHexamethonium CompoundsHexamethoniumIleumPoisonsTime FactorsMyofascial Pain SyndromesHyperalgesiaPatch-Clamp TechniquesElectric ConductivityComplex Regional Pain SyndromesToxins, BiologicalChronic DiseaseVisceral PainProcaineAcetylcholineDose-Response Relationship, DrugNeurilemmagamma-Aminobutyric AcidAxonsBatrachotoxinsAnuraArthralgiaMarine ToxinsNociceptorsRana esculentaMuscle RelaxationGastrointestinal MotilityCalcium Channel BlockersNAV1.8 Voltage-Gated Sodium ChannelAnalgesiaNeurotransmitter AgentsLabor PainDecapodiformesRats, WistarSpinal CordColonAconitineNorepinephrineNerve BlockTreatment OutcomeSerotoninMorphineCnidarian VenomsNeurotoxinsConotoxinsCapsaicinNeuromuscular JunctionMyenteric PlexusSubstance PExcitatory Amino Acid Antagonists