Can OCD cause schizophrenia? I unfortunately looked up a study that may have found a link between the two mental ailments and now I am freaking out. My grandma's cousin's husband's son had schizophrenia and I know that I am not related to them by blood, but I am still terrified that I may develop this illness sometime in my life. And that my OCD will somehow cause a chemical imbalance in my brain and give me the illness? Is that possible?