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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.
The list below shows some of the causes of Excessive hunger mentioned in various sources: 1  Amphetamine abuse-hunger. 2  Amphetamine withdrawal-increased appetite. 3  Anterior pituitary hyperhormonotrophic syndrome-increased appetite. 4  Bipolar disease-overeating and excessive appetite when in the manic phase.