BPD is a complex mental illness, often confusing for both the person living with BPD and those close to them. What is BPD?BPD is characterized by a persistent instability of one’s mood, interpersonal relationships, self-image, and/or behavior. BPD vs. Related DisordersBPD can sometimes be misdiagnosed because it co-exists with other disorders or shares similar traits with better-known disorders. The BPD ExperiencePersonal accounts of living with BPD. Experts Discuss BPDReThink BPD documentary with Dr. Yeomans.