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There have been several factors that have been pointed out as causes of obsessions. Some of these are stress, brain dysfunctions, brain chemicals, and habitual behavior. The following set of sections are probable points on what causes obsessions. slide 2 of 7. Stress has been considered as a factor in obsession and OCD. Stress can make a person vulnerable to fear, anxiety, and obsession.
People with these disorders know these thoughts are irrational but are afraid that somehow they might be true. These thoughts and impulses are upsetting, and people may try to ignore or suppress them. Examples of obsessions include: 1  Thoughts about harming or having harmed someone.