Antisocial personality disorder is characterized by a disregard for others, impulsive behavior, lack of guilt or remorse. It typically begins in childhood as antisocial conduct disorder, involving aggressive, destructive, or rule-breaking behavior. Symptoms include antisocial and impulsive behavior, disregard for societal standards, and no indication of fear or guilt. Potential causes include abnormal brain function, unstable childhood environments, and smoking during pregnancy. Treatment options include psychotherapy, institutionalization, group therapy, medications, and cognitive behavioral therapy.