As the use of electrodissection in tonsillectomy increases, uncertainty remains concerning any association with postoperative haemorrhage. However, there is some evidence to suggest that the more diathermy is used the risk of postoperative haemorrhage increases. The technique of vessel dissection and diathermy tonsillectomy (VDDT) is described and the results of 335 consecutive cases are presented. The results are discussed in relation to bipolar diathermy tonsillectomy and microbipolar diathermy tonsillectomy and also the U.K. National Prospective Tonsillectomy Audit. It is concluded that VDDT has the advantages of cold dissection while reducing diathermy to a minimum.