Affective disorders are commonly associated with a high rate of suicide attempts (SA) and completion. Lifetime prevalence of suicidal behavior (SB) is particularly elevated in bipolar disorder (BD) patients and was generally found to be higher than in major depressive disorder (MDD) subjects (Rihmer and Kiss, 2002). For instance, it has been estimated that the rate of suicide attempts in MDD and BD patients is two to six times higher respectively than in the general population (Tondo et al., 2007). However, not all patients suffering from BD or MDD actually attempt suicide. Additional factors must therefore play a role in increasing the suicide risk in these clinical populations.