As per Mayo Clinic which gives a very nice overview for the layman,
“A personality disorder is a mental health condition where people have a lifelong pattern of seeing themselves and reacting to others in ways that cause problems. People with personality disorders often have a hard time understanding emotions and tolerating distress. And they act impulsively. This makes it hard for them to relate to others, causing serious issues, and affecting their family life, social activities, work and school performance, and overall quality of life.”
https://www.mayoclinic.org/diseases-conditions/personality-disorders/symptoms-causes/syc-20354463
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