Dissociative identity disorder is strongly linked to severe childhood trauma such as sexual, physical, or psychological abuse. It can also be caused by an extremely frightening or unpredictable home environment, extreme stress from events like natural disasters, or accidents and torture. People with dissociative identity disorder are at increased risk of self-harm, suicide attempts, sexual and eating disorders, depression, sleep issues, anxiety, headaches, and difficulties in relationships and work due to an inability to cope with stress.

2. Causes
Dissociative identity disorder is strongly linked to severe experiences of early
childhood trauma or during the period of development, usually maltreatment like
• Sexual abuse
• Physical abuse
• Psychological abuse
• Ritual abuse
• Emotional abuse
Other causes include
• a home environment that's frightening or highly unpredictable.
• Extreme stress
• natural disasters
• any accident, torture, kidnapping etc.

3. Complications
• People with a dissassociative disorder are at increased risk of complications that
include:
• Self-mutilation
• Suicide attempts
• Sexual dysfunction, including sexual addiction or avoidance
• Depression
• Sleep disorders, including nightmares, insomnia and sleepwalking
• Anxiety disorders
• Eating disorders
• Severe headaches
• Dissassociative disorders are also associated with significant difficulties in
relationships and at work. People with these conditions often aren't able to cope
well with emotional or professional stress.