Medical Definition of Borderline personality disorder

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Reviewed on 12/11/2018

Borderline personality disorder: A personality type characterized by difficulty forming and keeping stable relationships, highly emotional or aggressive behavior, impulsivity, and rapid shifts in values, self-image, mood, and behavior.

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Reviewed on 12/11/2018