DID is a rare mental illness that results most often from early trauma, such as incest, repeated child abuse or sexual assault. People with DID develop distinct personalities referred to as ‘alters’. A person with DID may have as many as 100 or as few as 2 different alters. The alters usually differ greatly; some may be very young and vulnerable (a victim personality), while others may be aggressive or violent (a protector personality).
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