There are actually two forms of RDD, closely related to each other:
1) The aforementioned Reality Deficit Disorder (most often acute cases)
2) Reality Denial Disorder (a chronic condition)
Type 1 is often cured by such things as overcoming hardship, enjoying new experiences, and meeting new people. An open mind is both a symptom, and an avenue for recovery.
Type 2 almost always requires repeat treatment over the course of the patient's lifespan, and even then, the success rate is only 20%. Individuals classified as RDD Type 2 can still be contributing members of society, but are often either misanthropic or shunned by others. Identified causes of RDD Type 2 include poor upbringing, public school, traumatic events, propaganda, television, religious cults, social welfare programs, and mind-altering substances. RDD Type 2 may manifest itself in a number of ways, including but not limited to street-corner preaching, thinking of one's self as an artist, politics, monuments made of one's self, and posting comments on YouTube.