The first signs of borderline personality disorder usually appear by late childhood. The most common early signs are impulsive and reckless behavior. The disorder often fully develops in the late teens to early twenties. The risk of suicide associated with borderline personality disorder is greatest in the young adult years and gradually decreases with age. In the adult years, the disorder causes intense emotions, impulsive behaviors, and unstable relationships. Uncontrolled emotions and fear of being abandoned often lead to job losses, failed marriages, and uncompleted education.
Treatment can be very challenging. People with borderline personality disorder frequently have difficult relationships with their doctors. They often see others as either "good" or "bad." A shift from one view to the other, called splitting, can occur suddenly in any relationship for minor reasons. These changes in feeling often are a source of tension between a person with borderline personality disorder and doctors. Splitting is also a common source of tension in relationships with friends and family members
Severe symptoms such as self-destructive and suicidal behavior, irrational thinking, and emotional problems related to relationships may improve as you begin treatment. Some symptoms may last longer, such as feelings of anger or emptiness or abandonment, suspiciousness, and difficulty tolerating being alone. . Often other disorders occur along with borderline personality disorder as well and also need treatment (for example, depression or substance abuse).
The majority of those with this disorder gain more stable emotions, relationships, and employment during their 30s or 40s. Many people who get treatment for borderline personality disorder do decrease destructive behaviors, often within the first year of treatment. According to the research, around half of those diagnosed with borderline personality disorder no longer have many of the behaviors associated with the disorder after about 10 years of treatment.