Mr Usman Jaffer discusses the success rate of sympathectomy and the risks involved. This procedure is over 90% successful but there are some complications which can occur. A major side effect is compensatory sweating, which is excessive sweating in other parts of the body. As a result, up to 30% regret having sympathectomy done. Therefore, in some cases where the primary symptoms are not severe enough, the benefits of sympathectomy may not outweigh the side effects. Overall, it is a highly effective treatment but the overall benefit must be considered.