Sharp interpreted their findings as suggesting that borderline personality disorder

Bordeline personalitie disorders

Explanation:

A mental disorder characterized by unstable moods, behavior, and relationships.

Very common

More than 3 million US cases per year

Treatable by a medical professional

Chronic: can last for years or be lifelong

Requires a medical diagnosis

Lab tests or imaging not required

The cause of borderline personality disorder isn't well understood. Diagnosis is made based on symptoms.

Symptoms include emotional instability, feelings of worthlessness, insecurity, impulsivity, and impaired social relationships.

Treatments include talk therapy or, in some cases, medications. Hospitalization helps if symptoms are severe.