WebMD Answers
Borderline personality disorder is a mental illness that causes intense mood swings, impulsive behaviors, and severe problems with relationships and self-worth. People with this disorder often have other problems such as depression, eating disorders, or substance abuse.
Most of the time, signs of the disorder first appear in childhood. But problems often don't start until early adulthood. Treatment can be very hard, and getting better can take years. This is because problems with emotions and behaviors are hard to improve. But treatment may work better than experts used to think. Most people with severe symptoms get better over time.
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