It was investigated 114 patients with sen-soneural deafness, suffering from pancreatic diabetes of I (56 patients) and of II (58) type, also 15 practicaly health and with goo hearing people as the control group. To all patients there was made an investigation of bioelectric activity according to the EEG data. It was showed that in patients with SND and PD there were some norm deviations in the brain functional state. But the more considerable and deeper abnormalities in the brain structure were finding in patients with SND and PD of the II type. The enquired data witnessed about productivity of bioelectric activity of brain according to the results of EEG status indices and by the treatment of patients with SND, suffering from pancreatic diabetes and also by the resolving expertise questions.