Diabetes mellitus (DM) adversely affects the skeleton and the physiological mechanisms implicated have not been explained sufficiently. Thus, the objective was to identify inflammatory cytokines (IL-1, IL-6 and TNF-alpha) in patients with T1DM and their association with markers of bone formation (sPINP) and markers of bone resorption (sCTX). We studied 62 patients of 18 years of age or more with T1DM. We determined the values of HbA1c, vitamin D, inflammatory cytokines, as well as those of markers of bone formation and of markers of bone resorption. 49 patients were female with a mean age of 33.5 years. We found values of HbA1c > 7.5 in 83 %, vitamin D of 16 ng/mL. In patients with HbA1c >7.5 we found a positive correlation between TNF-alpha and sCTX (r = 0.43, p = 0.05), IL-6 and sCTX (r = 0.48, p = 0.037). With a model of simple linear regression between IL-6 and sCTX, it was found a beta coefficient of 23.8 with a p = 0.030 (95 % CI = 2-45.6), ie.: for every unit increase in IL-6 there is a sCTX increase of 23.8 pg/mL. We found a positive association between TNF-alpha and IL-6 with the marker of bone resorption (sCTX) in the group of patients with HbA1c > 7.5. The loss of metabolic control was associated with TNF-alpha and IL-6.