Koro is a psychiatric condition in which someone develops the false belief that their genitals are shrinking back inside their body. Koro can cause high levels of anxiety in patients.
Before diagnosing, it is important to make a thorough physical examination to ensure that there is not a genuine cause for the shrinking of the genitals.
Possible causes of the condition are either from cultural myths and beliefs, or a symptom of a further psychiatric disorder. Drug use may also be a factor causing the condition.