Exposure to subjective care burden was found in relatives of patients with bipolar disorder and schizophrenia. However, no statistically difference was found between groups regarding care burden. This can be explained by chronic and remitting-relapsing nature of schizophrenia and bipolar disorder. Relatives of patients exposed to care burden may experience similar difficulties from this point of view. Another issue to be mentioned here is although bipolar disorder does not cause cognitive and executive dysfunction as much as schizophrenia, it can cause care burden at least as much as schizophrenia from care burden related with functional loss.