Among the neuromuscular diseases (NMDs) over 800 individual entities have been identified. The vast majority of these diseases occur very seldom but all NMDs together add up to a prevalence of 1:1,500. Accordingly the conclusion "seldom diseases are common" seems to be appropriate. The scope of NMDs is very wide varying from the affection of single muscle groups to the complete musculature, from slowly progressive to fulminant progressive forms, from perinatal to the adult manifestation as well as number, course and character of associated comorbidities. Due to the wide heterogeneity concerning NMDs it is of great importance for anesthesiologists to be knowledgeable on relevant comorbidities as well as indications and contraindications for the various anesthetics.