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No monority or social class or area of the world has OCD more prevailant than another. OCD is an "equal opportunity disorder" so to speak. For this reason, many people that have investigated the cause of OCD have come to some different conclusions: it's genetic, a learned behavior, or a chemical imbalance in the brain. According to this Article some cases of OCD are not considered OCD until later in life. This means that maybe it is more a psychological disorder that slowly increases over time.
Surfing this website, you can check out the more in depth info and opinions on the different theories of what causes OCD.
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