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The use of ultrasound-guided (USG) technique for regional blocks is a well- established method in regional anaesthesia with the added advantage of providing real-time images of the plexus and nerves and surrounding structures, while significantly minimizing complications. Even if the evidence is in favour of USG guided blocks suggesting that the complications and frequency of complications are significantly lower, this review article is all about few complications that have been published so far in the scientific literature. The complications encountered following USG guided blocks has been categorised into two broad headings: technical and non-technical (neurological, haematological, miscellaneous) in this article.